Vazquez had his mask knocked off his face by a backswing during Thursday's 6-2 loss to the Yankees, Chad Jennings of the Boston Herald reports.
Vazquez remained in the game after the incident, but it's something the Red Sox will monitor heading into Friday's game. "He continued to check out fine after the back swing by [Gary] Sanchez caught him on the side of the head," manager John Farrell said. "We were taking every precaution in between to maintain his alertness, which he did."