Cespedes stated he's dealing with calcification in both his heels, which will require surgery at some point, Joe Trezza of MLB.com reports.
When asked if he could make it through the rest of the season, Cespedes, who homered in his return to the lineup Friday, stated "I don't know." He'll likely attempt to wait until the end of the year before undergoing surgery, which has a recovery time of 8-to-10 months.