Dereck Chisora’s preparations for his heavyweight grudge fight with David Haye are in disarray after he was attacked by his own coach.

The 28-year-old Londoner will settle his differences with Haye at Upton Park on July 14, four months after the pair came to blows at a press conference in Munich.

But Chisora may have to complete his training without long-term mentor Don Charles who revealed he lashed out after his fighter asked him to remove his headgear.

Bust up: Dereck Chisora was attacked by his coach Don Charles

The fight, which will be watched by a bumper crowd at the home of West Ham, has been beset by problems since it was announced.

Neither Chisora nor Haye are licensed by the British Boxing Board of Control (BBBC) which led to the Luxembourg Boxing Federation stepping in.

The BBBC responded by threatening to expel anyone involved in the controversial fight which led to several fighters opting not to appear on the undercard.

The main support bout, Alexander Povetkin’s WBA world heavyweight title defence against Hasim Rahman, will instead take place in Germany due to TV scheduling issues.

Charles was also involved in the infamous brawl in February after Chisora lost his world title fight to Vitali Klitschko.

At one stage Haye swung a camera tripod violently at the coach after trading blows with him.

‘I won’t go into the details as to why he wanted his head gear off,’ Charles told BoxNation. ‘There’s a way to tell someone something and it’s called respect.

Head to head: Chisora (right) and David Haye will fight next month

‘I’m not a nutter. He asked me to take his head gear off and I physically attacked him.

‘It’s the worst thing that’s happened since I’ve been with him and I’ve been with him for 10 years; I’m like a father to him.

‘There is no father around, he’s the man in his house so he finds it very hard to take instructions from another man. There is definitely a problem there.

‘I regret attacking him because you should never put your hands on someone but I’m a human being with emotions so don’t disrespect me.

‘I will not tolerate it. My mother and father don’t talk to me like that and certainly not someone I’ve helped for 10 years to become the boxer he is.’

With just over two weeks until the talking stops, Charles remains in the dark as to whether he will work with Chisora again.