The Baltimore Ravens have needed a center since Matt Birk's retirement following the 2012 Super Bowl championship season. Gino Gradkowski stepped in for the 2013 campaign, but struggled mightily. Gradkowski proved he wasn't fit to be the starting center, so the team traded for Jeremy Zuttah. Zuttah was serviceable during his first season, but fell off a cliff over the next two years. Zuttah was traded to the San Francisco 49ers this offseason, and now the team is bringing in a savvy Pro Bowl veteran for a visit as a possible replacement.
Nick Mangold is visiting the Ravens
