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Capitals' Alexander Semin, bottom, collides with Philadelphia's Mike Knuble in the first period. ((Nick Wass/Associated Press))

Philadelphia Flyers winger Mike Knuble, who scored the winning goal in double overtime against Washington on Thursday, will be unavailable for Game 6 Monday and if necessary, Game 7 the following night.

Knuble partially tore his left hamstring in the second period of a 3-2 loss in Game 5 of the NHL Eastern Conference quarter-final Saturday afternoon when he stumbled to the ice in a moment of indecision over whether to try to block a shot.

Knuble, who collected four points in the first five games of the NHL Eastern Conference quarter-final, tried to stretch the muscle while on the bench but was unable to return.

He had 29 goals and 55 points during the regular season. Knuble was also minus-3, his worst rating since the 1999-2000 campaign (minus-7).

On Thursday, Knuble banged in a rebound of his own shot at 6:40 of the second overtime period to thrill the home fans and give the Flyers a 3-1 series lead.