By Scott Trotter Manchester United owner Avram Glazer looks set to attend their FA Cup semi-final this weekend after being snapped with boxer Derek Chisora in London. The United co-owner, who appeared to be travelling with his brother Joel, posed for a photograph with the British fighter. The 40-year-old boxer described Glazer as an ‘old friend’, as he claimed a selfie with the US businessman. Posting on Instgram, Chisora said: “What a great day, catching up with my old friend @manchesterunited”. It means that the United owners are in England’s capital just days ahead of their club playing at …