Three days after charges against him were dropped, quarterback Mark Sanchez said he had been reinstated by USC.
Sanchez told the Los Angeles Times on Monday that he had rejoined the team.
Prosecutors decided Friday not to file charges against Sanchez , who had been accused of sexually assaulting another USC student.
Los Angeles County deputy district attorney Richard Tacklander, who reviewed the case, concluded there was "a lack of sufficient evidence beyond a reasonable doubt."
USC had suspended Sanchez, who is listed as the backup quarterback to John David Booty on the team's depth chart. He is expected to battle for the starting quarterback job this fall. Booty practiced only once this spring before he injured his back and had to undergo surgery.
"I'm just so happy it's over and now I'm just working to get past it," Sanchez told the Times.
Coach Pete Carroll told the paper that Sanchez could face internal team discipline for underage drinking and using fake identification. The two met, and Sanchez worked out on Monday, the Times reported.
The Associated Press contributed to this report.