Manning (lat) has resumed throwing bullpen sessions twice weekly and is aiming to return to action before Triple-A Toledo's regular season ends Sept. 22, Evan Petzold of the Detroit Free Press reports.

Manning last pitched July 14 before informing the Tigers during the All-Star break that he was dealing with a right lat strain. He was shut down from activity for about a month before he resumed his throwing program. Though both Manning and the Tigers are optimistic he'll pitch again this season for the Triple-A club, he may not have enough time to get fully stretched out for a traditional starting role.