Birk has spent the past four seasons with the Ravens after playing 11 years for the Minnesota Vikings.
While obviously not garnering the attention that Lewis has, Birk is nonetheless one of the top centers in recent NFL history and no doubt will be missed, giving the Super Bowl champs yet another hole to fill as they prepare to defend their title in 2013.
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Terry McCormick covers the Titans for TitanInsider.comFollow @footballpost on Twitter for the latest news
This story originally appeared on Nationalfootballpost.com