He is expected to miss all of the 2012-13 season, as well. He suffered the injury in his left knee during Monday’s game against Marquette.
Last season, he suffered another ACL injury, as he tore his ACL in his right knee.
He had an MRI on his knee on Tuesday, which shown the damage. It was originally thought to have been a hyper-extended knee.
In 11 games this season, he was averaging 4 points and 3.8 rebounds per game.
“I don’t think any of us could imagine this happening to such a fine young man,” Louisville head coach Rick Pitino said. “All of us are just crushed. We had thought he had just hyper-extended the knee when he had turned for a simple block out and it turned out to be terribly wrong. We will stay close to Rakeem so we can keep his spirits high.”