Habs vs. Lightning, Winning goal was offsides

At the 02:06 mark of the second overtime, Tampa Bay Lighting forward Nikita Kucherov scored the game-winning goal against the Montreal Canadiens. There is one problem, the play appears to be offsides. You can see the play in question below. After the game, the Habs coach Michel Therrien wasn't happy with the Lightning being offsides on the zone entry.