A's lefty Jordan Norberto, stationed on the disabled list since Aug. 21 with shoulder tendinitis, is playing catch on a regular basis but has still yet to throw off the mound.
"Once he does that and goes after it a bit harder, we'll probably have a better idea," Melvin said.
At this point, Norberto is unlikely to be available for the early rounds of the playoffs, should the A's participate.
A's lefty Brett Anderson (right oblique) is on track to throw a bullpen session on Monday. If all goes well during that session, Anderson could possibly be considered to start a potential one-game Wild Card playoff on Friday.