Minor league outfielder Cesar Puello was removed from the restricted list and placed on the 40-man roster.
To make room, the Mets placed Matt Harvey on the 60-day disabled list.
Puello was suspended 50 games at the beginning of August due to his connection to the Biogenesis scandal. Jordany Valdespin, who was also suspended, was put on the 40-man roster earlier this week.
Puello will not be called up to the major league team.