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Vancouver Canucks' Alexander Elder (left) puts Toronto Maple Leafs' Colby Armstrong into the boards as they battle for control of the puck during second period NHL hockey action in Toronto on Saturday December 17, 2011. THE CANADIAN PRESS/Pawel DwulitPawel Dwulit/The Canadian Press

Another player fell victim to the rash of concussions that is sweeping the NHL, although Toronto Maple Leafs head coach Ron Wilson said Colby Armstrong tried to keep it hidden for a while.

At the game-day skate on Monday, Armstrong's health was in question because he missed practice on Sunday. The Leaf winger was said to have a sore foot because of a collision with Vancouver Canucks forward Ryan Kesler in a game Saturday night. Armstrong missed 23 games with an ankle sprain earlier this season but this injury was to his opposite foot, so it was not considered serious.

After the skate, Armstrong told reporters he felt good enough to play against the Kings. But that changed in the afternoon and it had nothing to do with his foot, although it was assumed after the game that was why he did not appear in the lineup.

As it turned out, it was his head that was the problem, literally as well as figuratively. Wilson said Armstrong actually suffered a concussion in the Canucks game and tried to hide it from the team's medical staff.

But on Monday afternoon Armstrong was stricken by concussion symptoms, becoming so nauseated he threw up. Wilson said Armstrong, who already missed 23 games this season with a foot injury, is now out of the lineup indefinitely.

"He didn't tell the trainer he had his bell rung [in the Canucks game]" Wilson said. "He kept it from us. Now he'll be out for however long it takes [to recover]"

The Leafs will call up someone from their Toronto Marlies farm team to replace Armstrong.