Ravens make a late roster move; could O-line be in trouble?

Twenty-eight hours before their divisional round matchup with the Steelers, the Ravens made a roster move, waiving fullback Jason McKie and promoting guard/center Bryan Mattison from their practice squad to the active roster.

It's possible that the move indicates that starting center Matt Birk's knee injury is a serious concern to the coaches and front office. Birk is listed as questionable for tomorrow's game, and he missed two days of practice this week before returning in a limited capacity for today's walkthrough.

Birk had played the last three weeks despite being listed on the injury report with the knee ailment.

Mattison can play any of the interior positions on the line and has special teams experience. He was active for two games earlier this season.

If Birk cannot suit up, Chris Chester will slide over from right guard to play center. The Ravens could then insert Tony Moll at guard or move right tackle Marshal Yanda to guard and put Oniel Cousins in at right tackle.

None of that would be good news as the Ravens prepare to face the team that led the NFL in sacks this season.

McKie is let go after spending the last six weeks with the Ravens, although he was not active for a single game.

Ironically, the veteran fullback was signed by the Ravens the week of their last matchup with Pittsburgh. Starting fullback Le'Ron McClain was battling a sprained ankle at the time, and the team wanted some insurance in case McClain needed multiple weeks to recover.

Because McClain healed quicker than expected, McKie was never needed on gamedays.

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