Football is the only one of 26 sports that hasn't sold out for the London 2012 Olympics, according to BBC Sport.
Around 1.5m tickets are yet to be sold, with only 800,000 of the 2.3m allocated gone so far.
Organisers have suggested the slump could be because the draw has yet to be made. Games will be decided on April 24.
"The general problem is that Olympic football is not seen as the pinnacle," said Football Supporters' Federation chairman Malcolm Clarke.
"Most die-hard fans will be heading to Poland and Ukraine for Euro 2012 and wouldn't have even thought about the Olympics."
"They should have also priced the tickets much lower. I'm sure sales will pick up to an extent, but I'd be very surprised if there was a surge."
Preliminary matches begin on Wednesday, July 25.
Written by
Pascal Lemesre
Pascal Lemesre
