"I'm feeling great," Harvin said after Thursday's practice. "I didn't have any setbacks. These practices have been very good. I'm really confident about this game."
Harvin, who had major hip surgery to repair a torn labrum Aug. 1, has played in only one game this season. He returned for the Nov. 17 game against his former Minnesota Vikings teammates, playing 19 snaps.
But Harvin suffered a setback after the game with swelling and stiffness in his hip. He didn't practice again until last week.
"I know it has been frustrating for a lot of people," Harvin said. "My hat's off to this organization for staying patient with me. I'm ready to make it all pay off."
Seattle coach Pete Carroll said Harvin will have no limitations in the game.
"It's been a long, long haul for a guy that's such a great competitor. We've been so close so many times to taking this step. We just waited it out as long as we could," Carroll said. "The couple weeks we gained [with the first-round bye last week] made a difference. Percy stuck to it and never backed off the process of the rehab. We're anxious to add him to the mix."
Harvin plans to return kickoffs Saturday along with playing receiver.
"This is a fantastic group led by No. 3 [quarterback Russell Wilson]," Harvin said. "I'm just looking to fit in any way I can.
"The foundation is set. I'm just looking to jump on the bus and enjoy the ride."
Harvin was asked if he has any concerns about suffering another setback.
"It goes through my mind," he said. "But I'm just gonna cut it loose. I made all the cuts in practice that I possibly could do in the game. I felt no limitations, and no swelling came back. I'm gonna go out there and give it all I have."