Alex Mack in, Joe Haden out for Browns

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As the Browns face a steep uphill climb in Oakland on Sunday, they’ll get a boost from the return of center Alex Mack.

Mack is active, 13 days after having an emergency (as opposed to an elective) appendectomy.

But out for the Browns is cornerback Joe Haden, who suffered a knee injury in the team’s last game, two weeks ago against the Titans.

Also out for the Browns are quarterback Thaddeus Lewis, receiver Carlton Mitchell, safety Eric Hagg, offensive linemen Oniel Cousins and John Greco, and tight end Jordan Cameron.