The Reds activated Moll (shoulder) from the 15-day injured list Tuesday.
Moll has been out all season with a left shoulder issue and had experienced a minor setback earlier this month, but he's been cleared to rejoin the Reds' bullpen after allowing six runs with a 6:2 K:BB over 7.1 rehab innings. The southpaw earned high-leverage work with the Reds last season, but he'll probably be eased into such situations initially this year.