Super Bowl XLVIII is the biggest game of Denver Broncos coach John Fox's career -- and possibly the most lucrative as well.

Fox has a $1 million bonus built into his contract if the Broncos win the Super Bowl, a source familiar with the contract told ESPN.

Fox, who has one season remaining on his contract, already has had discussions with the Broncos regarding an extension.

Both the Broncos and Fox hope to reach an agreement on an extension this offseason. Denver plays the Seattle Seahawks in the Super Bowl on Sunday night.