The Reds recalled Moll from Triple-A Louisville on Wednesday.
The Reds optioned Moll to Triple-A Louisville on Monday, Mark Sheldon of MLB.com reports.
Moll allowed two hits and struck out two over a scoreless ninth inning in Tuesday's 8-1 win over the Phillies.
The Reds activated Moll (shoulder) from the 15-day injured list Tuesday.
Moll (shoulder) made his first appearance in a week for Triple-A Louisville on Sunday while on a rehab assignment. He allowed a walk and struck out one over a scoreless inning.
Moll (shoulder) was sent to Triple-A Louisville on Friday to begin a rehab assignment, Mark Sheldon of MLB.com reports.
The Reds placed Moll (shoulder) on the 15-day injured list Wednesday.
Reds manager David Bell said Friday that Moll (shoulder) will begin the season on the injured list, Charlie Goldsmith of The Cincinnati Enquirer reports.
Moll allowed two runs on two hits and two walks over one inning in Monday's spring game against the Giants.
Moll (shoulder) will make his Cactus League debut Monday, C. Trent Rosecrans of The Athletic reports.