The Akron, Ohio-based manufacturer has been involved in the sport since 1954. For the last two decades, Goodyear has been the exclusive tire supplier for NASCAR’s top three series.

That relationship will continue for at least the next five years as part of a new deal which will be formally announced Saturday morning at Homestead-Miami Speedway, sources said.

As recently as last weekend, Stu Grant, Goodyear’s general manager of worldwide racing, had told Motorsport.com that an extension was “very close” and would be announced “hopefully very soon.”

Although there was talk as far out as a year ago of other tire manufacturers interested in competing for deal, it has become increasingly clear as this season dragged on that Goodyear would remain as NASCAR’s sole tire supplier.

Goodyear has already undertaken several tire tests in preparation for next season, including working on a tire combination for the infield road course at Charlotte Motor Speedway, which will be utilized for the first time in both the Xfinity and Monster Energy NASCAR Cup series next season.

Goodyear Racing last signed a new five-year extension in 2011 that is set to expire at the end of this year. Typically, Goodyear and NASCAR have reached extension deals a year or more out from the current contract’s conclusion.

The drawn out process this time had raised the specter that NASCAR could be negotiating with other suppliers.