Indianapolis Colts linebacker A.J. Edds left the field with a knee injury during Monday's practice, and indications are the injury may be serious.

There is speculation that Edds may have suffered a torn anterior cruciate ligament, in which case he would need surgery and probably be lost for the season.

Edds appeared in 11 games between the Colts and New England Patriots last season.

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Terry McCormick covers the Titans for TitanInsider.com