Thibodeau did not sound optimistic about Boozer's chances to play Sunday against the Los Angeles Lakers.
"Not sure yet," Thibodeau said when asked about Boozer's status. "[He was] still a little sore [Friday], so we'll see."
Boozer, who has been dealing with the same injury off and on for the last several weeks, reinjured the calf while jumping around in the locker room and trying to get warmed up before Thursday night's game against the Golden State Warriors.
Thibodeau did not think that Boozer would do much at Saturday's practice.
"Very limited," Thibodeau said. "I don't think he'll do much."
Thibodeau isn't sure exactly when Boozer will return.
"Day to day," he said. "We'll just see where he is. The last time he wasn't out long, but we'll see."
Bulls swingman Tornike Shengelia left the team on Saturday because of a death in his family. His return date is unclear.
If Boozer is unable to play, that means the Bulls will enter Sunday's contest with just nine healthy players.