Dexter Fowler has been activated from the disabled list after missing 12 games with a right heel spur.
To make room for Fowler, the Cardinals optioned OF/IF Jose Martinez to triple-A Memphis.
Fowler is second on the team with 40 runs scored and will hit third for the Cardinals Friday against the Mets.
Martinez, who hit third and scored a run for the Cardinals on Thursday, is hitting .280 with five home runs and 17 RBIs this season.
First pitch Friday is set for 7:15 at Busch Stadium.