Cespedes is in the final year of a four-year, $36 million deal he signed with the Oakland Athletics before the 2012 season.
The Mets acquired Cespedes at the trade deadline in a deal with the Detroit Tigers. The 29-year-old has played for four teams in his four-year career after coming over from Cuba before the 2012 season.
In 43 games for New York, the centerfielder is hitting .295 with 17 home runs and 42 RBIs.
Entering play Friday, the Mets held an eight-game lead in the NL East over the Washington Nationals.
- Kenny Ducey