Chicago Blackhawks coach Joel Quenneville apologized Friday for an obscene gesture he made during the second overtime of the Hawks' 4-3 loss to the Blues in Game 1 of the playoffs on Thursday night.

"I was definitely excited and disappointed at the call," Quenneville said. "I apologize for my behavior. It wasn't very appropriate at all. It was a bush-league move on my part."

A source said the NHL is looking into the gesture, which Quenneville made after an apparent delay-of-game penalty that would have given the Hawks a five-on-three power play was not called. Quenneville grabbed his groin with his right hand as he yelled at officials. Quenneville said he had not yet heard from the league about any possible punishment.

The Blues won the game in the third overtime.