The 49ers agreed with Staley on a six-year contract extension Thursday. Financial terms of the deal, which runs through the 2017 season, weren't disclosed.
Staley said in a conference call with reporters that he didn't expect to receive a new contract this offseason, but the team approached him about it.
"I was thinking maybe if I played a solid year next year, they'd come to me, but they've obviously shown that they believe in me enough to get this deal done," Staley said. "I think that also shows what they are trying to do here is keep a lot of the core young players that they feel are building blocks for this franchise."
Mike Singletary, who's entering his first full season as the 49ers' head coach, hopes to establish a younger, balanced attack, and McCloughan is doing his best to provide him with those players. In addition to handing Staley an extension, San Francisco drafted wide receiver Michael Crabtree in the first round and running back Glen Coffee in the third round and signed 26-year-old wide receiver Brandon Jones in free agency.
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"I really wanted to stay here," Staley said. "I believe in what we have going here with the coaching staff and the whole franchise. ... I'm excited to get this deal done, and now we can move forward and hopefully get some other guys signed here."
That team-first attitude is one of the things that attracted the 49ers to Staley in the first place, and McCloughan said in his statement it was why the team was so excited to sign the offensive tackle to a long-term contract.