INDIANAPOLIS -- Indiana freshman center Luke Fischer will miss a few weeks because of a sprained left shoulder.

Fischer, Wisconsin's Mr. Basketball, is expected to play a key role in helping to replace Cody Zeller, who gave up his last two seasons of eligibility to jump to the NBA. The Hoosiers also lost freshman Troy Williams for a few weeks with an undisclosed hand injury.

Coach Tom Crean said the 6-foot-11 Fischer was playing aggressively when he was injured.

Two other Hoosiers -- swingman Austin Etherington and center Peter Jurkin -- are cleared to practice. Etherington is returning from a fractured left patella, while Jurkin is trying to return from a lower leg injury.

Crean will give his annual preseason lecture on campus Wednesday.