Alex Poythress will miss the remainder of the 14-15 season for Kentucky with a torn ACL.
Poythress suffered the injury during Thursday's practice.
"When you're coaching other people's children and these children have high aspirations and unlimited potential -- not only to do things for themselves but for other people -- I can't begin to tell you the feeling when someone gets hurt," coach John Calipari said in a release. "My own son, Brad, tore his ACL last year. All I can tell you is I was physically sick when it happened to him. I feel exactly the same way now that it's happened to Alex."
Pursuing a title was a key motivation for Poythress to return for a third season with the Wildcats after last spring's NCAA title-game loss to Connecticut.