He added: "We know that however many tickets we provide it would never be enough - we could probably sell out a stadium with a million seats!
"But if supporters just want to savour the experience then they can use the fan park in downtown Athens."
Uefa, meanwhile, are not expecting trouble between the two sets of supporters.
Gaillard said: "There is no history of hostility between them and it gives us an advantage that we have the experience of these fans in a final in similar circumstances two years ago."