The Seahawks, who also signed former Vikings wide receiver Sidney Rice two years ago, now have another valuable piece in their quest to take the NFC title away from San Francisco. The 49ers were thought, too, to have interest in Harvin.
"He's so good you just have to showcase him, and that's what they're doing," Seahawks coach Pete Carroll said in October before the Vikings-Seahawks game. Carroll, who recruited Harvin out of high school when he was at USC, added: "He's a fantastic player."
AP Sports Writer Tim Booth in Seattle contributed to this report.