The NFL reportedly blew the whistle on an Indiana man’s plans to trademark "Harbowl" in anticipation that the sibling coaches would face each other in a Super Bowl.

Roy Fox told ESPN he spent more than $1,000 to file trademarks for "Harbowl" and "Harbaugh Bowl" before the conference championship games last season.

Fox abandoned the trademarks in October, after he said the NFL threatened to have him pay the legal bills racked up when the league took action to oppose his filing.

The league has yet to trademark any slogans or sayings related to the Feb. 3 Super Bowl, where Jim Harbaugh’s San Francisco 49ers and John Harbaugh’s Baltimore Ravens will face off in the championship game.