Andreas Johnsson's season is officially over.

The Toronto Maple Leafs forward is expected to be sidelined six months after undergoing successful knee surgery Wednesday, the club announced.

Johnsson suffered the injury during his team's 3-2 loss to the Dallas Stars on Thursday after awkwardly colliding with teammate Kasperi Kapanen.

The 25-year-old winger, who missed 15 games earlier this season with a separate leg injury, contributed eight goals and 21 points in 43 games.

Toronto traded for a depth forward with NHL experience Wednesday, acquiring center Denis Malgin from the Florida Panthers in exchange for winger Mason Marchment.

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