Brook, 28, was slated for a possible fight with Brandon Rios on September 12 after talks over the summer, although ‘The Special One’ will have to wait a few more weeks after being overlooked for a fight with Floyd Mayweather Jr.
“Kell Brook is up for fighting anyway, whether it’s Mayweather, Thurman or Khan – it doesn’t really matter,” Hearn told Sky Sports.
“We were looking at getting Kell out on September 12 but it’s likely now that it will be the end of October back in Sheffield.”
One possible target for Brook’s return to action is fellow-undefeated WBA ‘regular’ champion Keith ‘One Time’ Thurman following the American’s recent win over Luis Collazo, which the Briton ran the rule over.
“We talk all the time whether it’s by text or on the phone. He watched Thurman’s performance and he’s always fancied the fight – it’s not a case of he saw it and thought he was poor. It’s just a fight he believes he can win,” said Hearn.
“He believes he can beat everyone in the division. He has respect for Thurman and they’ve complimented each other in every interview but it’s a fight that’s inevitable down the road.
“We’d like to keep growing Kell in the UK. We wouldn’t rule out a US fight and Thurman is focused on the US thing. Kell is ready to fight anyone if the deal makes sense.
“There’s nobody in the division I could ask him to fight and he wouldn’t. I love the Timothy Bradley fight and it could be unification as well, so that’s a fight we’re also interested in.
“If Kell has to travel to the US for those fights then it’s not a problem but he’s a pay-per-view fighter in the UK and doing well so that’s where he sees his future. He wants the best and will travel to do it but my job is to try and make these fights in the UK. That’s best for British boxing.”
Rios could still be in the frame for the challenge even with the delay, although more will be revealed in the coming weeks once Brook gets back to full-time training.