"I think he's ahead of schedule," Acta said. "He's a quick healer."
Choo hasn't played since June 24 after an injured left thumb required surgery. After icing it for a while before Monday's game, he was able to warm up with the team while wearing a brace on his left hand.
He was all smiles in the Cleveland clubhouse, and while the team has been optimistic about his progress, Acta remained level-headed.
"After batting practice, there's the next step and the next step, so I'm not going to talk about when he's going to start [a rehab assignment], or anything like that," Acta said. "He should take it one day at a time."