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Report: Packers LB Matthews expected to miss one month

(SportsNetwork.com) - Green Bay Packers star linebacker Clay Matthews could miss a month of action with a broken thumb, according to ESPN.com.

Matthews suffered the injury in Sunday's victory over the Detroit Lions.

"Clay Matthews' injury situation, he's actually in an appointment and all the information's not in yet," Packers coach Mike McCarthy said Monday afternoon.

McCarthy also said that the injury occurred on the final play of the third quarter, when Matthews sacked Lions quarterback Matthew Stafford for a 12-yard loss. Matthews headed to the locker room shortly after the play.

The Milwaukee Journal Sentinel said that all indications point to Matthews needing surgery on the thumb.

Matthews has 18 tackles and three sacks in four games this season. The USC product had 43 tackles and 13 sacks in 12 games last year.

10/07 20:06:39 ET