Liverpool fan Souvik Pal, 19, was seen leaving Trafford's Warehouse Project, which is less than a mile from the Old Trafford stadium.
Twickenham, Wembley, Anfield, Old Trafford and the Emirates Stadium would be the English venues for the tournament, with the final to be played at Twickenham.
And when the club unveiled a bronze statue outside its home stadium, Old Trafford, and named the North Stand after him, the timing suggested he might be ready to bow out.
That visit also included tours of some of the stadiums that form part of England's bid - Old Trafford, City of Manchester Stadium, St James' Park and the Stadium of Light and gave the Fifa delegation a chance to inspect transport, stadiums and security.
That means Old Trafford, Anfield and the Emirates Stadium will be in high demand before the Rugby World Cup comes to town.
Hampden's possible role in hosting the football event is likely to be shared with the Millennium Stadium in Cardiff, Old Trafford in Manchester, St James's Park in Newcastle, Villa Park in Birmingham and Windsor Park in Belfast.
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The only exceptions are Wembley Stadium, St James' Park, Old Trafford and North Greenwich Arena, where existing licensing agreements mean all spectators need a ticket, regardless of their age.
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But the policy will not apply to events held at Wembley Stadium, St James' Park, Old Trafford and North Greenwich Arena, where licensing rules require everyone to have a ticket.
While fans of Manchester United or Liverpool would scorn at the renaming of Old Trafford as the Aon Arena or Anfield as the Standard Chartered Stadium, regular rechristening is the norm for the 18 Bundesliga teams.
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Improving the atmosphere in an existing stadium is obviously different to building it up from scratch and Keirle says one solution for Old Trafford could be to pump noise via microphones around the ground.
In contrast, Old Trafford (Manchester United), Estadio Santiago Bernabeu (Real Madrid), Camp Nou (Barcelona), Emirates Stadium (Arsenal), hold between 60, 000 and 99, 000.
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