Quintero, who suffered a concussion after being hit in the head by the follow-through of a bat against the Dodgers on July 1, has been taking batting practice and doing some light catching work while on the DL.
"He's been swinging in the cage, off the machine, blocking balls and stuff," manager Cecil Cooper said. "He actually threw to the bases and all that, so physically, from that standpoint, he's fine. What we need is medical clearance."
If he is cleared, Quintero will be sent to Double-A Corpus Christi for a couple of rehabilitation starts before coming back to Houston.
Felipe Paulino, who has been in a rehab-and-conditioning program with the Astros since June because of a pinched nerve in his right triceps, has been making progress, according to Astros general manager Ed Wade.
"He threw about 25 or 30 pitches in the bullpen and felt good coming out, so he'll probably get a day off tomorrow and we'll pick it back up from there," Wade said before Friday's game. "Our hope still is that we can get him built up to where he can go out on a rehab assignment and maybe pitch in the big leagues for us at some point in time this season."
Krysten Oliphant is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.