Syndergaard pitched a scoreless inning out of the bullpen in Tuesday's 6-4 loss to the White Sox.
He completed the frame on 17 pitches, striking out two batters en route to his first career hold. The 23-year-old was available after being ejected from his last start after 2.1 innings (34 pitches), and his use out of the bullpen will not affect his availability or workload for Friday's start against the Marlins.