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The final month of Major League Baseball’s regular season is just around the corner. For many teams, that means help is on the way.

Starting Monday, Sept. 1, teams are allowed to carry as many as 40 players on their active roster. And after playing the first five months of the season with a strict 25-man squad, the chance to bolster a roster with upward of 15 additional players, whether it be in the form of serviceable depth or young, talented prospects, can be the deciding factor for teams still in the playoff hunt.  

At face value, the expansion of rosters in September makes for an exciting end to the season—especially after the implementation of a second wild-card spot. However, MLB teams will never be fully on board with the idea until the system itself is reformed to favor all 30 clubs equally.

Outrage over September call-ups is nothing new. Back in 2009, Milwaukee Brewers general manager Doug Melvin blasted the notion of expanded rosters in a conversation with MLB.com:

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With rosters set to expand from 25 to 40 players on Monday, September call-up fever is officially in the air.

In the last week we’ve looked this year’s potential call-ups in a variety of ways, including an overall ranking, position-by-position breakdown and, more recently, a deeper look at prospects capable of improving their teams’ playoff chances.

And with roster expansion still a long weekend away, we’ll be rolling out even more call-up-related content in the coming days.

The rankings for this article were based on those released earlier in the week in our look at the top 25 call-up candidates. However, instead of simply identifying the best prospects, this article strives to focus on players who have been rumored to be in the mix for a call-up as well as those facing an imminent promotion thanks to a spot on the 40-man roster.

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Teams now have less than a week to decide which of their prospects, if any, will be promoted to the major leagues on Sept. 1.

While most clubs typically recall players already on their 40-man roster, teams chasing a playoff berth may be more inclined to think outside the box and take a chance on a prospect not already on the roster.

Last season, some of the game’s top prospects, namely Billy Hamilton and Yordano Ventura, were promoted to the major leagues on Sept. 1 and ultimately made significant contributions to their respective teams over the final month of the season.

This year, we’re unlikely to see playoff contenders call up their big-name, future stars for the stretch run, but there will be numerous lesser-known but deserving prospects promoted when rosters expand Monday.

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Chris Sale went from first-round draft pick in 2010 to big league reliever in a span of two months, beginning what has turned out to be a brilliant five-year career with the Chicago White Sox.

This year, the stage has been set for fellow left-hander Carlos Rodon, the No. 3 overall pick in this year’s draft, to follow in Sale’s footsteps, as his recent promotion to Triple-A Charlotte has fueled speculation that his professional debut will conclude in the major leagues.

Earlier this month, Scott Merkin of MLB.com reported there was a "better-than-average chance" the White Sox will promote Rodon to the major leagues in September, just as they did with Sale five years prior.

Since then, the front office has tried to temper expectations regarding a potential Rodon call-up, with general manager Rick Hahn recently discussing the situation on the Mully and Hanley Show (h/t MLB Trade Rumors).

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Even though a majority of the game's top prospects have already received promotions, teams will receive an infusion of fresh, young talent on Sept. 1 when the active roster expands from 25 to 40 players.

With roughly five weeks remaining in the regular season, expanding rosters will allow teams to address their needs at the major league level by essentially plucking specific talent from within their farm systems. In general, it's an opportunity for every organization to add bench and bullpen depth by utilizing its full 40-man roster.

In anticipation of what should be a flurry of promotions starting next Monday, we've got you covered with a look at the top prospects ticketed for the major leagues for the season's final month. The rankings for this article are based primarily on Prospect Pipeline's midseason top 50 update, though factors such as 2014 performances, 40-man roster status and teams' specific needs at the major league level were also considered.

Here are the top 25 prospects most likely to be called up on Sept. 1.

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The 2013 playoff races were defined by strong rookie performances.

There was Michael Wacha, who went from first-round draft pick in 2012 to No. 2 starter for the St. Louis Cardinals down the stretch and well into the postseason. Gerrit Cole and Sonny Gray had similar impacts on their respective teams, as both right-handers reached the major leagues in the middle of the season and ultimately shined in their first tastes of playoff baseball.

Meanwhile, Billy Hamilton literally stole the show on the other side of the ball. The infamous speedster was called up in September and blew past all reasonable expectations by batting .368 with nine runs and 13 stolen bases over 13 games.

This season, there should be just as many, if not more, big-name prospects who influence their team’s quest for a playoff berth.

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The Los Angeles Angels suffered a potentially crushing blow Wednesday night when they lost ace Garrett Richards for the next six to nine months with a torn patellar tendon in his left knee.

Richards' injury couldn't have come at a worse time for the Angels, who currently hold a two-game lead over the Oakland A's in the American League West with an MLB-best 76-50 overall record. With the right-hander sidelined for the rest of the season, the Angels' rotation suddenly is much less threatening, especially in the context of a five- or seven-game playoff series.

However, rookie Matt Shoemaker did his best to ease those concerns Thursday night, guiding the Angels to a 2-0 victory and four-game road sweep of the Boston Red Sox.

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The 2014 season has seen a number of notable prospects receive call-ups to the major leagues. Even with the final month approaching, there will be more to come—and soon.

September brings with it expansion to 40-man rosters. Only a little more than a week away, that should allow for plenty of promotions of prime prospects.

Highly regarded youngsters like Marcus Stroman, Jonathan Singleton, Gregory Polanco, Ken Giles and Javier Baez have been seeing regular time for their respective clubs for quite some time now. Others, like Oscar Taveras and Taijuan Walker, have been shuttling up and down between the minors and majors for much of the year.

Earlier this week, the Boston Red Sox recalled outfielder Mookie Betts for yet another stint. He should stick for longer this time, considering they demoted incumbent center fielder Jackie Bradley Jr. to Triple-A Pawtucket to free up playing time for Betts.

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The expansion of the active roster from 25 to 40 players on September 1 means something different to every team. 

For clubs hoping to retain a lead in the standings or make one last run at the postseason, it’s essentially an opportunity to address deficiencies by handpicking the top talent from within the organization. 

Meanwhile, teams that have already thrown in the towel for the season have the freedom to experiment with their lineups and audition younger players.

In both scenarios, the common denominator is the use of prospects over the final month of the season. Whether those call-ups are fueling a team toward the postseason or competing for a spot in next year’s starting lineup, the success of prospects in September can receive as much attention as the playoff and MVP races.

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We’re now approaching the end of the minor league season, but there are plenty of prospects who continue to open eyes with their performances across the rookie, short-season and full-season levels.

For most players the season will conclude at the end of August, with a league playoff title representing the ultimate goal. However, there also will be several notable prospects, many of whom are featured in this article, whose seasons are extended with a September call-up.  

As we did in the series’ previous installments, this week’s list of players once again combines reports on both hitters and pitchers in the same slideshow. However, we’ll only be looking at just the hottest players because, well, there are a lot of them with the season winding down, and they’re all worth mentioning.

Here are the hottest players at every minor league level.