Indiana senior forward Collin Hartman suffered a knee injury on Tuesday and his condition is being evaluated, Indiana said.
"Senior forward Collin Hartman injured his left knee Tuesday in a non-contact drill during individual workouts. He will continue to be evaluated and his condition will be updated at an appropriate time," IU said in a statement.
Hartman tore his right ACL in March of 2014 in a workout. Hartman rehabbed in time to play in 32 games as a sophomore in 2014-15.
A 6-foot-7 senior forward, Hartman started 24 of the 35 games he played as a junior in 2015-16, averaging 5.0 points and 3.1 rebounds.
He was expected to be an experienced part of a deep front line for Indiana this season.
IU won the Big Ten regular-season title and reached the Sweet Sixteen last season.