Littell (oblique) was reinstated from the 15-day injured list Wednesday.
Littell sustained a left oblique strain in early July and spent just over a month on the injured list, but he was in the minors on a rehab assignment for two and a half weeks. The right-hander posted a 4.05 ERA and 1.20 WHIP in 6.2 innings over seven rehab appearances and will rejoin the Giants' bullpen ahead of Wednesday's game against the Diamondbacks.