The St. Louis Rams, Dallas Cowboys and Washington Redskins were other teams considering Westbrook, who ultimately said his decision wasn't all about money at this stage.
"My No. 1 concern throughout the process was going to a winning team, a football team that was coached by a man I respect and a team that had a winning tradition and players that would be able to achieve that," Westbrook said when formally introduced Monday night. "I think I found all of those things here in San Francisco. It was a long process but in the end I think it turned out well for me."