The charges stem from a Sept. 2 raid on their on-campus apartment. Police say the search turned up a small amount of marijuana.
According to the criminal complaint, police said a search of Evans' room in the apartment turned up three small, clear baggies containing marijuana.
The complaint also said the search of Koroma's room turned up a "roach," or partially smoked marijuana cigarette.
The complaint went on to state that police considered what was found in both rooms to be a "small amount" of marijuana that was intended for "personal use."
Evans and Koroma have not practiced or played with the team since Sept. 2.
Nittany Lion coach Joe Paterno declined to comment on their status with the program at his weekly press conference Tuesday.