The Raiders announced that offensive line coach Tony Sparano signed a two-year contract on Friday afternoon to remain with the club. That's a major coup and a positive sign that the Raiders didn't hold a stubborn line on one-year contracts for assistant coaches in 2014. Owner Mark Davis preferred one-year contracts to standard two-year deals for coaches with expiring contracts, but he turned out to be more flexible than most expected. He extended a deal for Sparano, a former head coach and coordinator who balked at the idea of returning on a one-year contract. He was linked with a possible move to the Tampa Bay Buccaneers, but that deal was never done. Sparano did an excellent job with an injury-plagued offensive line last season, his first with the Raiders. His leadership could help a healthier, reinforced line turn into a team strength. The status of other assistant coaches -- save offensive coordinator Greg Olson and linebackers coach Bob Sanders, who signed two-year deals last season -- remains uncertain.