The 2015 MLS draft will be heavy on seniors, and light on top underclassmen as the league struggles to sign the top college underclassmen.

The 2015 MLS draft is less than two weeks away, and all signs point to the event relying heavily on senior talent rather than the top underclassmen who have headlined previous drafts.

Sources have confirmed to Goal USA that MLS is in danger of missing out on several top underclassmen who have chosen to stay in school rather than accept Generation Adidas contracts.

Two of the four top draft-eligible underclassmen in the nation have passed on the chance to sign with MLS, while the other two may pass as well. UCLA coach Jorge Salcedo confirmed to Goal USA that UCLA freshman forward Abu Danladi has joined Georgetown sophomore forward Joshua Yaro on the list of players choosing to stay in school rather than turn pro.

UConn forward and Canadian national team player Cyle Larin has been mulling a contract offer from MLS, but sources tell Goal USA that negotiations have stalled. Sources also tell Goal USA Washington sophomore midfielder Cristian Roldan is leaning toward staying in school, but has not made a decision yet.

UPDATE- Sources are now telling Goal USA that MLS and Cyle Larin are close on a contract, and could have a deal done in the next day or two.

For several years, the MLS draft has been led by Generation Adidas signings, college underclassmen considered the best college prospects in the nation who also don't count against the salary caps of the teams that select them.

The Generation Adidas program has slowly been de-emphasized in recent years, as more and more top prospects move to MLS via homegrown player deals or skip MLS to play in Europe. The 2015 Generation Adidas class was always expected to be the smallest in the draft's history, but now with so many top prospects staying in school, the 2015 Generation Adidas class will likely be as weak as it is small.

Part of the reason for the reluctance of top underclassmen to turn pro this year could, at least in some part, be because of the fact MLS is set to sign a new collective bargaining agreement in the coming months, which is expected to lead to a higher salary cap. For players like Larin, Roldan, Danladi and Yaro, staying in school for a year could lead to significantly larger contracts heading into the 2016 MLS draft.

For its part, MLS is focusing on the signing of seniors for the draft.

Sources tell Goal USA that the league is preparing to announce a large class of senior signings, with UC-Davis defender Ramon Martin del Campo, Oregon State forward Khiry Shelton, Notre Dame midfielder Nick Besler, Michigan State forward Fatai Alashe, Maryland midfielder Dan Metzger, Washington defender Andy Thoma and North Carolina defender Boyd Okwuonu all expected to be announced as senior signings this week.

One senior who has yet to sign, and appears unlikely to sign before the draft, is UCLA midfielder Leo Stolz. One of the most talented players in the draft pool, Stolz's age (he'll be 24 when the season begins) and contract demands (such as trying to dictate which teams may draft him) have hurt his draft stock as well as the chances he signs an MLS contract before the draft.

MLS traditionally signs the top seniors in the draft to contracts prior to the MLS draft, and in many cases prior to the MLS player combine, which is the showcase event where draft-eligible players play in front of the league's coaches and general managers. The MLS combine begins Friday in Fort Lauderdale, Florida, a week before the 2015 MLS draft, on Jan. 15 in Philadelphia.

With several Generation Adidas targets potentially out of the picture, MLS has turned its attention to other underclassmen to sign. Central Florida forward Romario Williams is finalizing a deal, while Syracuse goalkeeper Alex Bono and North Carolina State defender Conor Donovan are now on the radar for Generation Adidas contracts.