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The Irish FA, UEFA and the Northern Ireland executive and the association have decided on the capacity for the game at national stadium Windsor Park.
Fans will be asked to show proof of double vaccination or provide a negative Covid test on entry.
Supporters of Villarreal will be able to travel from Spain for the match on August 11.
Irish FA chief executive Patrick Nelson said: “This represents a 30 per cent reduction in the overall stadium capacity and recognises the need to remain cautious given the ongoing health situation in Northern Ireland.
“We will continue to work closely with our partners at UEFA and the Northern Ireland Executive in the lead up to the game and look forward to delivering a memorable night for football in Belfast and Northern Ireland.”