The Latics fear Edman sustained the injury after being stretchered off during Wigan's 3-1 defeat to Blackburn on Saturday.

The Swedish international sustained the injury when falling awkwardly on his leg after a clash of heads with Rovers striker Jason Roberts.

Latics boss Steve Bruce has ruled Edman out of Wigan's last seven games of the season and fears he could be out as long as October.

"I think the Edman injury has affected us really badly, he has been rock solid since he has come and when he went off we lost that balance," Bruce told the club's official website.

"It looks as though he has ruptured a cruciate ligament which will be diagnosed within 24 hours and he could be out until October."

If Edman's worst fears are confirmed it will mean he misses this summer's Euro 2008 finals for Sweden.