The Ottawa Senators will likely be without their Norris Trophy-winning defenceman for the rest of the season.

Erik Karlsson, who was voted the NHL’s best blueliner last summer and was the team’s most valuable player this season after goalie Craig Anderson, left Wednesday night’s game against the Pittsburgh Penguins after suffering a lacerated Achilles tendon.

He fell to the ice after Penguins winger Matt Cooke’s skate sliced his leg during an attempted body check in the dying seconds of the second period.

Karlsson wasn’t able put any weight on his leg as he was helped off the ice and rushed to the dressing room, where medical staff assessed his injury.

The speedy defenceman was leading the Senators with six goals heading into Wednesday night’s game and was second in points (10) behind centre Kyle Turris.

Karlsson serves as the team’s offensive catalyst on the power play and had also started picking up significant time on the penalty kill.