NEW YORK - Boston Bruins forward Brad Marchand has received a warning from the NHL about licking the faces of his opponents.

Colin Campbell, the league's executive vice-president and director of hockey operations, spoke with Marchand and Bruins general manager Don Sweeney on Saturday.

According to the NHL, Campbell put Marchand on notice that his actions are unacceptable and similar behaviour in the future will lead to supplemental discipline.

Marchand licked the face of Tampa Bay forward Ryan Callahan in the second period of Friday night's 4-3 overtime victory by the Lightning, prompting the warning from the NHL.

"I don't know what the difference is between that and spitting in someone's face," Callahan said.

In Game 1 of Boston's first-round series against the Maple Leafs, Marchand licked the neck of Toronto forward Leo Komarov.