Kell Brook has been forced to pull out of his IBF world welterweight title defence against Diego Chaves because of a rib injury.
The Sheffield boxer suffered the injury in training yesterday and has had to delay the fight, which was due to take place in his home city on October 24.
"It's always a bitter blow when an injury causes a fight to be postponed, especially so close to the event," promoter Eddie Hearn told MatchroomBoxing.com.
"Kell picked up a rib injury in sparring yesterday and spent most of the day at hospital yesterday. Kell was desperate to fight but it was simply impossible and we will now look to reschedule the bout for the end of the year."
The event next weekend in the Steel City will still go ahead, with Chris Eubank Jr's WBA interim world middleweight fight against American Tony Jeter one of the bouts on the bill.
