Syndergaard exited Saturday's start versus the Cardinals with an apparent right hamstring injury, Tim Healey of Newsday reports.
Syndergaard came out for the seventh inning just short of the 100-pitch mark and limped off the field in the middle of his second batter of the inning. The 26-year-old allowed five runs (four earned) over six innings, with two inherited runners scoring after he left the game.