Vientos was removed from Thursday's game against Kansas City after getting hit on the hand by a pitch, Andrew Tredinnick of The Bergen Record reports.
Vientos ran for himself after taking a 92-mph sinker off his right hand in the bottom of the second inning, but he was replaced on defense when the Mets took the field in the third. He'll presumably be sent in for X-rays to determine whether he suffered a fracture, and an update on his status will likely come in the near future.