Major league rosters are made up of a number of different types of players, from top prospects who are set to take the league by storm to seasoned veterans who take up a substantial chunk of a team's payroll.
Whether it's for better or worse, every team has some player that just can't, and in some cases shouldn't, be moved.
Dominating aces are as indispensable as any position in the league and aren't often traded. And for different reasons, we see overpaid position players who just can't be traded either.
Here are some players of all makes that likely won't be departing from their current teams anytime soon.
The Arizona Diamondbacks certainly have the makeup of a team that could contend for the postseason at any moment, which is why it could come to a surprise to some that Justin Upton has been made available this offseason.
There's obviously a method to the way teams shift around players, and though it doesn't look like any deal to send Upton out of Arizona is imminent, the team no doubt would get a strong haul in return.
After signing B.J. Upton to a five-year, $75 million contract this offseason, the Atlanta Braves will no doubt hope that he's able to improve on the stats he's put up over his career with the Tampa Bay Rays.
Upton is untradable simply because he's so new to the team, we obviously won't see him change hands. But if he doesn't live up to expectations in Atlanta, his $15 million annual salary will be hard to move.
Seeing the Baltimore Orioles come back from the depths of the AL East in 2012 was no doubt one of the best stories of the entire season. And while they weren't able to make it all the way to the Fall Classic, they're definitely headed for big things in the coming years.
The Orioles handed out a massive deal to Adam Jones to make him the cornerstone of their franchise for years to come, and keeping him in the nucleus of to O's roster is crucial to continuing their success.
When the Boston Red Sox set out to break apart their roster last summer, they removed a number of big parts of their franchise in the process, cutting a massive amount of salary.
One player who survived was Jacoby Ellsbury—an MVP-caliber outfielder who has proven to be a game-changer when he can stay on the field.
As the Red Sox continue to work their way back into the AL East picture, having a player like Ellsbury around could go a long way in getting to where they hope to be in 2013 and beyond.
When you look at the Chicago Cubs roster, there really aren't a whole lot of soon-to-be free agents who will be focal points of the team moving forward.
Matt Garza is the type of pitcher who can certainly anchor a starting rotation, and he will be a free agent after the upcoming season. With the steady stream of trade talk involving Garza, it seems unlikely that he'll fit in long-term.
Paul Konerko has been with White Sox since 1999, and it's hard to picture him playing for any other team as he winds down his career.
He's been about as consistent as any player in the league over the past handful of seasons. While he won't command another massive deal when he enters free agency after the upcoming season, he's definitely the type of player that you want to have in your clubhouse.
The Cincinnati Reds made out big in the trade they pulled off this week, bringing in All-Star outfielder Shin-Soo Choo from the Cleveland Indians.
Choo has batted .291 over the past five seasons, averaging 16 home runs per season and driving in nearly 70 runs.
He'll be a free agent after this season, but the Reds probably aren't merely looking to rent a player for the season and let him walk. It would make sense for them to make sure he's in Cincinnati for years to come.
Much like Jacoby Ellsbury in Boston, the Cleveland Indians could find themselves going either direction with Ubaldo Jimenez.
When the Indians traded for Jimenez during the 2011 season, they expected to immediately contend for playoff positioning. But as Jimenez and other players haven't lived up to expectations, they seem to be resetting themselves.
They could opt to trade Jimenez and fully commit to rebuilding, but with Trevor Bauer ready for major league action, the Indians could very well develop a top-tier one-two punch if Jimenez can return to his old ways.
With the massive number of top-tier center fielders entering the free-agent market this offseason, many teams are shoring up their outfielders with players like B.J. Upton, Denard Span and eventually Michael Bourn.
Dexter Fowler is on a trajectory that could very well find him in the same situation when he enters free agency after the 2015 season.
The Colorado Rockies will likely wait a while to see how things pan out with Fowler, but locking him into a long-term contract before he nears the open market could save them valuable dollars down the road.
Taking home the Cy Young and MVP awards in 2011, Justin Verlander has shown that he's clearly among the best pitchers in the game, and he'll no doubt continue to reign as the Tigers' ace for years to come.
With a plethora of offensive options at the Tigers' disposal, having Verlander atop their starting rotation is key as they look to make another World Series appearance in 2013.
In full rebuilding mode, the Houston Astros won't have to make tough decisions on re-signing free agents for quite some time, as Jed Lowrie is the only player on the roster who will be entering free agency in the near future.
Even in that instance, Lowrie won't be a free agent until 2015, and he may very well not even be with the organization when that time comes.
In a bold move that surprised many in the baseball world, the Kansas City Royals traded away some top prospects, including Wil Myers, in an effort to shore up their starting rotation.
Adding James Shields as the team's ace will no doubt help their chances to contend in an AL Central that has some very beatable teams.
If they hope to sustain any success, however, they'll need to hand out plenty of money to Shields once he enters free agency after the 2014 season.
By making a substantial investment in Albert Pujols last offseason, the Los Angeles Angels ensured themselves that they'll have one of the most dynamic offensive players the league has ever seen in their lineup day after day.
He's not showing signs of it, but Pujols' performance will eventually decline, and when it does, it could be a tall order to move the $25 million annual salary he's taking in.
In a matter of six months, the Los Angeles Dodgers have transformed their roster, taking on a number of high-salary players that instantly made them contenders for a title.
As they continue to work their way through the NL West, they'll need to keep this roster in tact, showing that they weren't making snap decisions, but rather building a potential dynasty that could turn the tides in the National League.
After unloading about every piece of talent that they brought in just a year ago, there really isn't much room for positivity in the Miami Marlins clubhouse these days.
If the team was to work to extend one player remaining on its roster, it would have to be Giancarlo Stanton. But given his displeasure with the team's recent transactions, the team's chances of keeping him around for the long term are slim to none.
After seeing Prince Fielder depart last offseason, the Milwaukee Brewers found themselves short one slugger. But luckily, they still had Ryan Braun in tow.
Braun had another strong season in 2012 and showed exactly why the team couldn't survive without him.
When the Minnesota Twins hedged their bets on Joe Mauer to the tune of a $184 million contract, they ensured themselves that they'd be selling tickets with the hometown hero heading up their lineup in the newly-christened Target Field.
The Twins have since gone into full-out rebuilding mode, and with Mauer earning $23 million annually, moving the contact-hitting catcher would be a tall order.
In some respects, it's been a tough offseason for the New York Mets, as Cy Young winner R.A. Dickey was shipped north of the border to Toronto, albeit for some strong prospects that could prove to be good moves down the road.
The team did, however, make another big move in signing David Wright to a contract extension. In doing so, the Mets put to bed any rumors of his departure that came up over the past couple of seasons.
The New York Yankees are getting every ounce of production they possibly can out of Robinson Cano, as he hasn't played fewer than 159 games in seven seasons.
He's been an extremely consistent player in the pinstripes, batting .308 in his eight seasons with the Yankees and averaging nearly 25 home runs and 100 RBI along the way.
Cano is set to enter free agency after the upcoming season, and while he'll come at a steep price to the Yankees, there's been no evidence to prove he wouldn't be worth every penny.
Last offseason, the Oakland Athletics made a move that surprised many in the baseball world, signing Yoenis Cespedes away from the many suitors that could've been more common destinations for the slugger.
He proved to be a valuable part of the A's offense in 2012, and as they look to build on their postseason appearance in 2013 and beyond, Cespedes will no doubt be a part of their plans.
It would be an understatement to say that the 2012 season didn't go as planned for the Philadelphia Phillies. They struggled early on and fell into a hole that would prove to be too much to climb out of in the NL East.
Ryan Howard was solid once he came back from his 2011 injury, and though he'll no doubt continue to be an offensive threat, the $25 million annual salary he'll be paid from 2014-2016 could be hard to move even if the team wanted to.
Much like the Baltimore Orioles, the Pittsburgh Pirates are centering their lineup around a star outfielder in Andrew McCutchen.
For much of the season McCutchen was in the NL batting race, and with him locked in through 2018, the Pirates need to keep him around if they hope to work their way up the NL Central.
Chase Headley's name came into play during the deadline, as he emerged in trade talks concerning the New York Yankees (via Ken Rosenthal of Fox Sports).
They may not have been interested enough to make a deal at the time, something that could be just the fate the Padres needed to retain a budding star.
Headley is under team control until 2015, and his solid offense (.286 BA, .376 OBP) will certainly help the Padres moving forward.
After sustaining a serious injury that ended his 2011 season, Buster Posey came out swinging in 2012, putting together an MVP-worthy performance that added another bullet point to his already impressive resume.
The Giants enter the 2013 season with a target on their backs as world champions, and with the team going in the direction that Posey goes, it's hard to see him landing anywhere else.
As the cornerstone of a franchise that's struggled in recent seasons, Felix Hernandez is a player that the Mariners simply can't afford to lose.
He won't be a free agent for another two seasons, but at just 26 years, old it's never too soon to think about the future. Putting the constant trade talk to bed with a contract extension would help the fanbase in Seattle gain confidence in the direction of the franchise.
Handing out a massive contract to a catcher always has its risks, as it's the most physically taxing position on the field and can lead to injury and decreased performance due to wear and tear.
Nevertheless, that's exactly what the Cardinals did when they signed Yadier Molina to a five-year, $75 million contract.
There's no reason to move him now, but if he runs into health issues down the road, it could be hard to find someone willing to take on that salary.
Having missed 30-plus games in three of his first five seasons in the major leagues, Evan Longoria doesn't always project the image of a healthy third baseman.
When he is on the field, he's one of the best in the game. Still, Longoria and his contract, which ties him to Tampa Bay for the next decade, would be tough to move if the Rays looked to rebuild from the bottom up.
The Texas Rangers gave their top prospect a brief look at life in the major leagues this fall when Jurickson Profar made his debut with the team.
His name has come up in trade talks throughout the offseason, though it's become clear that Profar won't be going anywhere anytime soon—something that Rangers fans should feel very good about heading into 2013 and beyond.
The Toronto Blue Jays have transformed their roster this offseason through multiple blockbuster trades and the signing of one of last year's best offensive players in Melky Cabrera.
Even with all the new weapons in the lineup, their most dangerous asset is still Jose Bautista. He's the cornerstone of an offense that should be able to contend in the AL East for years to come, and he will no doubt be a candidate for a contract extension once his time comes.
After undergoing Tommy John surgery to repair his arm, Stephen Strasburg came back strong in 2012, though his innings limit would ultimately cut his contributions short.
Players like Ryan Zimmerman do have massive contracts that could prove to be hard to move if necessary, but a dynamic starting pitcher like Stephen Strasburg is definitely the most indispensable player on the Nationals roster, and he needs to stick around for years to come.