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 Uefa Cup 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 Uefa Cup final.
The 34-year-old, who retired from football after leaving West Bromwich Albion in January 2008, is currently completing his Uefa A licence coaching badges and has made no secret of his desire to move onto the football coaching ladder.
Shortly before Euro 2008, Zenit St Petersburg clinched the Uefa Cup, three years after CSKA Moscow had claimed the country's first European club trophy with victory in the same competition.