SANTA CLARA, Calif. (AP) -Left tackle Joe Staley has agreed to a six-year contract extension with the San Francisco 49ers that will keep him with the club through 2017.

A first-round pick in 2007, Staley started every game at right tackle as a rookie before moving to the other end of the line last year to replace the injury-prone Jonas Jennings.

Staley has played every offensive snap in his first two seasons with San Francisco since joining the club from Central Michigan.

General manager Scot McCloughan lauded Staley's work ethic in commenting on a deal he says puts the Niners in a good position going forward.