Adam Rubin of ESPN NY, Ronny Cedeno is being activated and will be in the lineup for Friday night's series opener, team officials said.
Rubin says Cedeno was taking early batting practice at new Marlins Park with teammates at 2:30 p.m.
Cedeno went 0-for-4 and played a full game at shortstop Thursday night for Class A St. Lucie.
Terry Collins has said he would use Cedeno regularly at shortstop until Ruben Tejada returned from the DL.
Cedeno last played April 20. He went on the DL with a side-muscle strain.
The Mets have yet to announce a corresponding move, but Collins said in Philly that it would be difficult for Jordany Valdespin to survive Cedeno's activation.