Gilbert, a 2011 second-round pick, started every game at right tackle last year for the Steelers. According to Football Outsiders' adjusted sack rate metric, the Steelers' offensive line ranked 22nd in the NFL last season and 27th in 2012. Pittsburgh allowed 43 sacks last year.
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Earlier this offseason, the Steelers signed Gilbert's high school and college teammate Maurkice Pouncey to a five-year extension.
- Alex Hampl