Carlos Takam has replaced Kubrat Pulev as the IBF mandatory challenger for Anthony Joshua at Principality Stadium in Cardiff on October 28. According to the source, Pulev will not be able to recover on time to make the title fight.
Joshua's promoter Eddie Hearn desperately needed to keep the show on with nearly 80,000 fans expected at the Cardiff stadium.
As well as Joshua's fight, fans will also witness Kal Yafai's world title defence against Sho Ishida, Katie Taylor's maiden world title challenge against Anahi Sanchez and Dillian Whyte vs Robert Helenius as well as 2016 Olympians Joe Cordina, Lawrence Okolie and Josh Buatsi.
Multiple reports are saying Pulev got injured during training, but several conflicting reports differ on what type of injury he suffered.
The fight will take place at the original venue of Cardiff on October 28. "IBF rules state that the mandatory will go to the next fighter in line which is Carlos Takam".
Promoter Eddie Hearn was initially not told about Pulev's injury but confirmed on Monday night that the Bulgarian would no longer be facing Joshua in the ring.
"It's a hard position for "AJ" having prepared meticulously for the style and height of Pulev, he now faces a completely different style and challenge in Takam".