Kentucky reserve forward Willie Cauley-Stein could be unavailable for the Wildcats' Elite Eight meeting with Michigan on Sunday.

The 7-foot sophomore left Kentucky's 74-69 win over Louisville early with a left ankle injury. He was seen limping badly on the way to the locker room after the injury occurred and on crutches after the game.

The school announced at halftime that Cauley-Stein would not return to the game and CBS sideline reporter Tracy Wolfson said she heard Cauley-Stein tell trainers, “I heard it pop."

"It's not a good ankle injury," Kentucky coach John Calipari said after the game. "Let me just put it that way."

Cauley-Stein entered Friday averaging 7.0 points, 6.2 rebounds and 2.9 blocks per game this season. His 101 blocks in 24.3 minutes per game ranked fifth in the country in the regular season. He's projected as a mid-to-late first-round pick in the spring's NBA draft.

Playing extended minutes in Cauley-Stein's absence on Friday, Kentucky freshman center Dakari Johnson posted 15 points and six rebounds in a surprise performance.