"The soreness has gone down quite a bit, so that's a good thing," Castro said. "All the reports have been pretty good, as far as what the staff and doctors think ... It's only been three or four days, so we're trying to get it to calm down as much as possible before we start pushing it again."
Astros manager A.J. Hinch echoed the positivity of the initial results, though cautioned that Castro's biggest test will come when he resumes catcher's activities.
It's not known when exactly that will be, but Castro said the goal is to use the entire 15 days on the disabled list to get healthy, possibly avoiding a rehab assignment.
"That's not something we've talked about yet," Castro said of a possible rehab assignment. "But because I have the 15 days to get everything in I need to do, that will be our kind of timeline and that's what we'll kind of shoot for, as far as how we're going to progress."
Chandler Rome is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.