Allen Crabbe was seen entering the training room on Tuesday wearing a boot on his right foot, according to a report from Bear Talk.
He missed practice and his status for Thursday's meeting with Arizona is up in the air after coach Mike Montgomery declined to offer any details.
Crabbe is averaging a team-high 15.7 points in conference, as well as a team-leading 6.6 rebounds.
His .893 free throw percentage in nine conference games is second best in the league, and he is also third in minutes per game at just under 37 a night.
Cal is coming off a 69-59 win over their rival Stanford, where Crabbe scored a game-high 18 points to go along with seven rebounds.
The Bears are currently tied for first place with Washington in the Pac-12 at 7-2.
Drew Shiller is a Web Producer at CSNBayArea.com. You can follow him on Twitter @DrewShiller.