By Carlos Boogs

Is the anticipated unification between WBO welterweight champion Jessie Vargas (27-1, 10KOs) and IBF champion Kell Brook (36-0, 25KOs) falling apart?

Vargas took to the social networks late Saturday night and tweeted that Brook is stalling to finalize the fight, which is making Vargas now look to a rematch with Timothy Bradley.

"He doesn't seem to be interested in the fight from the looks of it. Next big fight that the fans would enjoy would be the Bradley rematch," Vargas told his followers.

Vargas signed the contract some time ago, but there have been issues with finalizing the deal on Brook's end. The Sheffield fighter is looking to get a lot of money for the fight and certainly more than Vargas, who is reportedly getting $1.7 million to travel over to fight Brook on his home soil.

BoxingScene.com reported a few days go that Brook's promoter, Eddie Hearn of Matchroom, was already looking to push the fight back to a date in October. The fight was initially planned for late August and then a date in September.

According to Hearn, finalizing the date was dependant on the finalized date for Gennady Golovkin vs. Chris Eubank Jr. If Hearn finalized that fight for September 10, then Brook-Vargas would be staged at the Sheffield Arena on October 8. With Sheffield United at home on October 8, 15 and 29, Bramall Lane would only be available to host Brook-Vargas on October 1 and 22.

"Brook was going to be September 10 but there have been a few negotiations to overcome on that so that fight may be early October, or we could go September with it if Golovkin isn't September," Hearn added.

Hearn added on the social networks: "We are ready to go on our end, [Vargas] is on big money and got to make it work for both sides."

Vargas suffered his first career defeat last January, with a controversial twelfth and final round. After losing the majority of the fight, Vargas hurt Bradley badly in the closing moments of the final round and was trying to finish him off when the referee accidentally jumped in and stopped the fight about 10 seconds early. The referee mistakenly thought he heard the final bell. Vargas has been trying to get the rematch ever since.