The Phillies reinstated Sosa (back) from the 10-day injured list Tuesday, Corey Seidman of NBC Sports Philadelphia reports.
The 28-year-old has been sidelined since Sept. 6 due to back spasms, and he'll rejoin the Phillies on Tuesday after a brief stay on the shelf. Alec Bohm (hand) also returned from the injured list over the weekend, so Sosa should reclaim his role as a utility infielder.