Syndergaard (hamstring) was placed on the 10-day injured list Sunday, Tim Healey of Newsday reports.
Syndergaard was forced to exit Saturday's start against the Cardinals after suffering a right hamstring strain during the seventh inning. The 26-year-old is without a timeline for his return, but he is undergoing an MRI on Sunday to determine the severity of the injury. Robinson Cano (quadriceps) was activated off the IL in a corresponding move.