Promoter Bob Arum believes Dallas could still host Manny Pacquiao's fight with Floyd Mayweather Jnr in March next year.
Cowboys owner Jerry Jones has tabled a guaranteed $25m offer to stage the fight at the opulent Cowboys Stadium, setting up a bidding war with the MGM Grand in Las Vegas.
While the MGM could come up with a bigger offer based on closed circuit sales and the knock-on benefits of being in the gambling Mecca, the Dallas gate could be twice as big - and Arum likes the guarantee.
"I'm saying that Dallas is a real live possibility, and I have a fiduciary responsibility to Manny Pacquiao to get him the most money," said Arum.
The Dallas deal looked dead when Golden Boy Promotions chief executive Richard Schaefer, representing Mayweather, called off a trip to Texas last week.
But Arum insists all avenues should be explored ahead of what promises to be the biggest-grossing fight in the sport's history.
"I think everybody has an obligation to see," he added. "I know we can get the greatest offer in history from the Texas Stadium.
"My position is whoever has the best deal for those two fighters, that's where I want the deal."