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Todd Grantham's defense at Louisville was sixth in the nation in 2014, allowing 308.5 yards per game. (Associated Press)

Louisville defensive coordinator Todd Grantham has turned down an offer for the same position on new Oakland Raiders coach Jack Del Rio's staff, according to FOX Sports' Bruce Feldman, ESPN's Brett McMurphy and other reports.

Todd Grantham: "My family loves it in Louisville, and I think we are establishing something special here with Bobby Petrino and our staff." — Bruce Feldman (@BruceFeldmanCFB) January 28, 2015

Grantham, whose Cardinal defense was sixth in the nation this season in yardage allowed, was offered a two-year contract, according to a report this morning from the NFL Network's Ian Rapoport.

Before joining Bobby Petrino's staff at Louisville in 2014, Grantham served as Georgia's defensive coordinator from 2010-13 and was an assistant with the Colts, Texans, Browns and Cowboys from 1999-2009.