Anthony Joshua will face Carlos Takam in his world heavyweight defence in Cardiff after Kubrat Pulev pulled out with an injury.
Pulev was due to fight Joshua in Cardiff's Principality Stadium on October 28.
A shoulder injury forced the Bulgarian to pull out. He is mandatory challenger to the IBF and WBA champion.
Frenchman Takam, 36, will replace him, meaning Pulev faces a lengthy wait to fight Joshua after also losing his status as mandatory challenger with the IBF.
Now Anthony Joshua has less than two weeks to adjust to his new opponent.