"I'm kind of just being cautious with where I'm at right now," Castro said. "I think I'm probably capable of some full weight squats right now but we're just trying to make sure we're doing everything right to come back and stay back. It's been feeling really good."
Castro, eligible to come off the disabled list whenever he is ready, has been working with a physical therapist in Houston. He took batting practice on Thursday and said he will start catching some bullpen sessions in the next couple days.
"As far as everything has gone right now, I'm real happy with that," Castro said.
Castro and his trainers have been taking the rehabilitation easy in order to keep the swelling out of the knee after Castro had it drained on July 18.