His outing Tuesday at Washington had been up in the air since he left Thursday's win over Atlanta after five innings. The Mets will call up Dillon Gee from Triple-A Buffalo to pitch in his place.
Santana says a bullpen session before Sunday's 18-5 win over Chicago went fine but realizes the Mets, who announced the decision after the game, "had to be very careful." He has a history of injuries and New York is out of contention.
Santana says he's not sure if he'll see a doctor, adding that will be determined in the next few days.
Shortstop Jose Reyes expects to play at some point during the three-game series at Washington, although probably not on Monday. He has been sidelined since Aug. 26 by a right oblique strain.