Sosa is not in the lineup Wednesday for Game 4 of the NLDS against the Mets, Alex Coffey of The Philadelphia Inquirer reports.
Sosa is batting eighth and starting at third base against the Mets in Game 2 of the NLDS on Sunday.
The Phillies reinstated Sosa (back) from the 10-day injured list Tuesday, Corey Seidman of NBC Sports Philadelphia reports.
The Phillies placed Sosa on the 10-day injured list Sunday, retroactive to Sept. 7, due to back spasms.
Sosa is out of the lineup for Wednesday's game against the Blue Jays, Todd Zolecki of MLB.com reports.
Sosa went 2-for-4 with a solo homer, three RBI and a steal in Tuesday's win over the Dodgers.
Sosa will start at shortstop and will bat sixth in Wednesday's game against the Yankees.
Sosa (elbow) will start at second base and bat sixth in Tuesday's game in Detroit.
Sosa was hit by a pitch in the fifth inning of Saturday's game against the Diamondbacks and has a left elbow contusion, Brooke Destra of NBCSPhilly reports.
Sosa is out of the lineup for Monday's game against the Padres.