Updated

A person with knowledge of the deal says fullback Bruce Miller has agreed to terms on a three-year contract extension with the San Francisco 49ers.

The person spoke on condition of anonymity Thursday because Miller had yet to sign. The do-everything Miller was lost for the season Dec. 15 with a left shoulder blade injury sustained during a win at Tampa Bay.

Miller had a tough time using the arm after the game. He took a hard hit from Buccaneers safety Keith Tandy after a 10-yard catch midway through the fourth quarter.

Miller has been a key blocker for 1,000-yard rusher Frank Gore, and had 25 catches for 243 yards for the 49ers. He worked to convert from college defensive end to NFL fullback.

ESPN first reported Miller's extension.

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AP NFL website: www.pro32.ap.org