Clutterbuck left the game against the Calgary Flames early in the third period after apparently suffering the injury while delivering a check.
The Islanders acquired the 25-year-old forward from the Minnesota Wild at the 2013 NHL Draft in exchange for prospect Nino Niederreiter. A restricted free agent at the time, Clutterbuck signed a four-year contract with the Islanders.
I don't think it's really truly going to sink in until we drop the puck, to be honest. I know there's going to be a lot of smoke and mirrors with the media attention and all that. We came [Monday] and it was sort of a light day to get things organized. We just want to focus in on the business aspect, the game itself. That's what we're preparing to do. Get these next couple of days out of the way and it's game on.
— Lightning captain Steven Stamkos on playing in his first Stanley Cup Final