Francis Ngannou has claimed he accidentally knocked out rival Cyril Gane with a head kick in sparring when the pair trained together.
The heavyweights will meet in a title clash at UFC 270 with Ngannou set to fight in his final contracted bout with the UFC as negotiations over a new deal continue to stall.
Footage emerged from his rivals' camp of the pair training together at the MMA Factory gym in Paris.
