The trade deadline has come and passed, with the Yankees making plenty of trades to bolster their roster. You think their roster's set, though? Not even close.

With rosters expanding in September here are 10 minor leaguers that can make an impact at the big league level. (* Technically Hughes is on the DL but he's pretty much a minor leaguer as of now).

1. Phillip Hughes, SP: A former top prospect and the youngest pitcher in the major leagues when camp broke, Hughes struggled early on in 2008, putting up as many walks as strikeouts (13 in 22 IP) to go along with an earned run an inning. I'm still confident he will be back to his old self again when he gets back. With a new pair of Oakley glasses Hughes is set to be the next wild thing. (No joke, see Phil's blog).

There have been rumors Hughes will come back in the bullpen but with the success of Veras, Robertson, and others the rotation seems to be a bigger need. I think Hughes' five seasons of outstanding minor league service (312/67 K/BB rate, 2.07 era, .86 Whip) outweigh bad couple of weeks in the majors, lets just hope I'm right.

2. Ian Kennedy, SP: Like Hughes, Kennedy started the year as a top prospect before failing to meet expectations and subsequently going down with an injury. Also like Hughes, I believe Kennedy will be back to his own self. In a couple of professional season Kennedy put up 208 strikeouts in a little under 200 IP to go along with 67 walks. Kennedy has also succeed so far this season in the minor leagues.

He has a 32/12 K/BB rate in 39 triple A innings along with a 2.03 era and .89 whip, similar numbers to those he put up in 2007. Kennedy also had a no-hitter going through 6 2/3 innings at Scranton-Wilkes Barre, furthering his status as one of the Yankees' top prospects. With both Darrell Rasner and Sidney Ponson struggling lately, Kennedy is a good bet to be back up by September.

3. Mark Melancon, RP/SP: This guy is the first real prospect on this list, as Phil Hughes and Ian Kennedy have both made a impact at the big league level. Melancon wasn't considered for most top 10 or even 20 Yankees prospects list coming into the season, however Brian Cashman's favorite minor leaguer has broken out big time.

With 47 strikeouts to only 12 walks in 49 double-A innings Melancon was able to post a 1.81 era and .89 whip. He also posted an undefeated 6-0 record for what that's worth. His chance of making an impact this year got even greater when Brian Cashman called him untouchable in trade talks, then promoted him to triple-A Scranton Wilkes Barre.

He's been used primarily as a reliever this year, however he is considered a decent starting prospect as well. If he makes an impact this year though it will probably be in the bullpen.

4. Austin Jackson, CF: Jackson, the Yankees top outfield prospect, has hit at every level in the Yankees system since exploding onto the seen last year. Hes currently hitting .287 with an over .800 OPS and nine home runs to go along with 15 steals. Hes been even hotter the past few weeks.

After the departure of Jose Tabata as part of the Xavier Nady deal, Jackson finally doesnt have to worry about who is the Yankees centerfielder of the future. With Melky Cabera hitting poorly this season and Austin Jackson tearing up the minors its possible Jackson's up this September and maybe takes over the full-time centerfield duties. Then again, next season is more likely.

5. Brett Gardner, CF: Although Jackson is the long term future in CF, Gardner might be more major league ready as of now. His debut wasn't nearly what many had hope for as he went 9 for 59, however he did impress on the base paths stealing 5 bases in 5 tries.

Gardner also has the advantage of being one of Joe Girardi's favorite players, something that can not be underestimated. His minor league track record is of a guy who gets on base, steals bases, and doesn't strikeout. If he get recalled to the majors and can continue to perform like he is in the minors, he could make a huge impact on the AL East race.

6. Alfredo Acevec, SP/RP: I have to admit, I had no idea who Aceves was coming into the year and for good reason. He pitched last season in the Mexican league, however since signing with the Yankees, he has risen through the system.

Aceves has combined for a 2.15 era, .88 whip, and 91 strikeouts to only 17 walks in 108 innings through three levels. Yankees GM Brian Cashman even went to a Scranton-Wilkes Barre game to watch him pitch. Aceves has started at all three levels, however he is a possible candidate for the bullpen. Expect him up in September.

7. Chase Wright, SP: Chase Wright is a solid guy if the Yankees need a spot starter at some point between now and October. However, I don't think you will see him hang onto a rotation spot long term. He pitched decently in Trenton posting a sub-3.00 era in 91 innings, however his K/BB rate was only 53/34 witch is cause for concern.

Cashman recently promoted Wright to AAA Scranton along with Mark Melancon, making it even more likely we will see him in the big leagues at some point.

8. Kei Igawa, SP/LR: Igawa may be a career AAAA pitcher, let's just hope he isn't. His AAA numbers this year are fantastic (3.55 era, 1.17 whip, 97/37 k/bb in 126 2/3 innings), however his MLB numbers (6 runs in 4 innings) are horrendous.

With his great performance in AAA, especially recently, it appears as though he will be brought up when rosters expand. If he can perform even close to his AAA level he could be an important long reliever/spot starter for the playoff run, however for some reason I doubt he will. 

9. James Brent Cox, RP: Cox has been called the replacement for Mariano Rivera for as long as I can remember, however it now appears as though he has been passed by Melancon for that title. This is mainly because of his struggles this year (14/11 K/BB in 31 innings to go with an over 4 era) coupled with Melancon's success.

Still his 109/44 career K/BB rate and 2.84 career era in the minors do outweigh 31 innings this season. Cox has lost some of his former top prospect status, however, I still believe who could potentially be called up and give the bullpen a boost.

10. Alan Horne, SP: When camp broke this season, Horne was the top arm in the Yankees minor league system. Since then, injuries have limited him to 32 innings pitched. Even when he has been in the rotation he has struggled with a 24/22 K/BB rate. Injuries probably contributed to this, but the rust is still there.

He could make it up to the big leagues in September; however, next year seems more likely. Disappointing to see a 25-year-old lose another year in the minors.

Okay, so there you have it, 10 guys the Yankees should call up this September who could impact the race.

Here are some honorable mentions: Justin Christian, Eric Duncan, Jaun Miranda, George Kontos, Phil Coke.

Alex Geshwind is a sabermetric fantasy baseball anylist for fantasybullpen.com. He can be contacted at alex.geshwind@fantasybullpen.com.