Per SNY's Steve Gelbs, Collins said Syndergaard likely has tendinitis in his biceps.
Syndergaard, 24, has established himself as the ace of a very good Mets pitching staff. After being named to the All-Star team last season, he is 1-1 with a 1.73 ERA and 0.89 WHIP in four starts in 2017.
Alongside Jacob deGrom, Harvey and Steven Matz, the Mets are loaded in the rotation. But injuries have become a storyline for this group. Harvey missed a chunk of 2016 after requiring surgery for thoracic outlet syndrome, while deGrom required elbow surgery in September.
There is plenty of panic in New York anytime a pitcher suffers an injury, so there will be concern about this development for Syndergaard.