Oleksandr Usyk reacts to John Fury's 'dirty' headbutt on a member of his camp - and accuses 59-year-old of 'hooligan' behaviour ahead of heavyweight title fight against Tyson Fury

Fury Snr sparked controversy when he headbutted a young member of Usyk's camp in the Riyadh Hilton Hotel lobby on Tuesday, coming away with a bloodied face.