Gasol sat out Game 4 with a hamstring injury and did not practice Monday, only doing rehab work to the hamstring.
Gasol has not ruled out playing in Game 6, but added that he hasn't run at full speed or changed direction yet.
On Tuesday, Gasol worked through a series of stretching exercises for the strained left hamstring with Thibodeau keeping hope that his power forward would be a game-time decision.
Asked whether Gasol was improving, Thibodeau said, "A little bit."
Gasol has averaged 12.6 points and six rebounds for the three games he's played in the series.
The Bulls lead the series 3-1.
Though he admitted to not feeling 100 percent,
Mirotic missed Game 3 and didn't have the best game on Saturday. He finished the game with five points, two assists and one rebound.
Mirotic, who missed Game 3 with a bruised left knee and strained quadriceps, was warming up without an issue before the game and given the green light to play.
"We'll go back to our old rotation. There's enough for everybody."
The bruised left knee of
Mirotic might not be available until at least a likely second-round battle against Cleveland. The Bulls can complete a sweep of the Bucks on Saturday.
Tom Thibodeau said it was a good sign that Mirotic has been shooting, but admitted that he was doing no running. "We don't want to jump ahead," Thibodeau said. "If he's ready to play, he plays; if he's not ready to play, he'll sit. It's that simple."
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