LONDON – David Haye and Dereck Chisora are to face each other at Upton Park on 14 July in a fight sanctioned by the Luxembourg Boxing Federation.The British heavyweights were involved in a brawl following Chisora’s defeat by Vitali Klitschko in Munich. The British Boxing Board of Control will not sanction the fight because neither holds a British licence.Chisora had his licence withdrawn after a number of controversial incidents before and after the Klitschko fight - but he has appealed against the decision.The 28-year-old slapped Klitschko at the weight-in and spat water at the Ukrainian’s brother Wladimir before the contest.Haye relinquished his licence when he retired in October last year , three months after losing his WBA title to Wladimir in Hamburg.Warren had previously said he would not go ahead with a fight between the two boxers.However, he said he changed his mind because Chisora’s appeal against his licence withdrawal had been "pushed back to July”.Warren said: "What he [Chisora] did was stupid and there should be some sort of punishment. "But he will be out of action for six months and will lose money. Why should he not make a living?”Chisora was granted a licence to fight by the Luxembourg Boxing Federation but Warren added that "a number of commissions” had been willing to do so.When asked whether holding the fight might threaten his own licence as a promoter with the British Boxing Board of Control, Warren said he hoped they would not hold it against him.