The league said there was no conclusive evidence that Grabovski bit Canadiens forward Max Pacioretty.
Pacioretty says he got a precautionary tetanus shot after the incident in Toronto's 6-0 victory.
The forward emerged from the skirmish showing his arm to the officials and claiming that Grabovski bit him.
During the third-period melee, Pacioretty wrapped an arm around Grabovski's face from behind.
Grabovski received a 10-minute misconduct and a roughing minor after the scuffle. Pacioretty was also issued a 10-minute misconduct.
"It was an emotional game," Pacioretty said Monday. "It got out of hand. People were fired up."
In Game 1 of the 2011 Stanley Cup final, Alex Burrows appeared to bite the finger of Boston centre Patrice Bergeron. There was no suspension issued in that incident.