There were also questions about expense claims from officials who had organised a meeting with Greater Manchester Passenger Transport Executive on the day of the UefaCup final in 2008 between Rangers and Zenit St Petersburg.
Manchester United's game with Rangers at Old Trafford on 14 September could present security problems given the Scottish club's fans rioted in Manchester at the 2008's UefaCup final.
Shortly before Euro 2008, Zenit St Petersburg clinched the UefaCup, three years after CSKA Moscow had claimed the country's first European club trophy with victory in the same competition.