"Not many people can say they have performed during five Super Bowl openings," Williams said in a statement. "I am so happy to have been part of the ABC family since 1989, and with my love for football, this was a win-win partnership."
Williams said he'll attend the Super Bowl in Detroit on Feb. 5 with one of his rowdy friends and root for the Steelers.
"My rowdy rebel son Kid Rock and I will be making some noise in Michigan ... everyone should be listening," he said.
"Monday Night Football" is moving to the ABC-owned ESPN cable network next season. The move falls on a year when Williams' contract is up for negotiation, and it is still uncertain whether he will continue as the show's musical host, Williams spokesman Kirt Webster said Wednesday.
Meanwhile, fans of Eminem's Shady Records will get a chance to party with the label during Super Bowl weekend.
Public tickets for the Feb. 4 "Shady Bowl Super Party," which cost $30 to $100, were to go on sale Friday. It had previously been uncertain whether the party would be open to the public, the Detroit Free Press reported.
The party at the State Theatre, located near the site of the Super Bowl, is scheduled to feature Shady artists Obie Trice, Stat Quo and Bobby Clearwater, with Biz Markie as DJ for the night.
Organizers haven't said whether Eminem will perform.