After collapsing from the stands during England's Euro 2020 game against Croatia on Sunday, a fan is in a 'serious condition.'
There are preparations in the works to conduct a complete investigation into the event, which occurred just after England's 1-0 victory.
"We can confirm that a spectator fell from the stands just after kick-off in the match between England and Croatia at Wembley Stadium," a Wembley Stadium official told Sky Sports News.
"The spectator was given on-site medical attention and was then taken to hospital in a serious condition.
"We will continue to work with UEFA to ensure the matter is fully investigated and we are continuing to monitor the situation."
UEFA verified the occurrence but refuses to disclose further due to privacy concerns.
18,497 people at Wembley Stadium saw the match.
Since November 2019, it was the first England game at Wembley, with supporters allowed.
Before the final on July 11, UEFA hopes to boost the permissible crowd inside the 90,000-seat stadium.