Bilbao, May 20 -- Around 80,000 English football supporters could descend on the city of Bilbao (northern Spain) for Wednesday's Europa League final, with at least 30,000 of those without tickets, Chief Constable Mark Roberts has warned.

In an interview with the 'Guardian' newspaper, Roberts urged those without tickets "not to travel", highlighting high travel and accommodation costs in the city.

"We'd really encourage fans without tickets not to travel," said Roberts.

"I know people like to go and enjoy the atmosphere and that's fair enough but while Bilbao is a great city, it's not a big city. The cost of flights and hotels is fairly astronomical. People are not going to be able to get anywhere near the stadium and without that abil...