Mason Mount appeared to sing 'God Save the Queen' ahead of England's opening World Cup game against Iran.
Gareth Southgate's side kicked off their Group B campaign at the Khalifa International Stadium on Monday afternoon.
Players lined up to belt out the national anthem, as is tradition, but Chelsea midfielder Mount looked to get his words mixed up.
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Instead of singing 'God Save the King', fans believe the 23-year-old instead said 'God Save the Queen'.
In September, Queen Elizabeth II died at her royal residence in Balmoral after 70 years on the throne. It saw Charles, the former Prince of Wales, become King Charles II.
This is the first international tournament England players have competed at since the death of Queen Elizabeth II.
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An easy mistake for Mount to make. He lines up alongside Jude Bellingham and Declan Rice in midfield.
Supporters online have had their say on the footage which has gone viral.
One person said: "I don't think anyone told Mount the Queen is no longer head of state."
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Another commented: "Does he know?"
A third tweeted: "Someone should probably tell Mount the news."
While someone put: "Did Mount just sing that?"
Southgate's opted to change England's formation from what they were playing in Nations League games earlier this year.
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Rather than a back three, he's opted for a 4-3-3. It's given him the option of another midfielder, which allows Bellingham to make his first World Cup start.
Bukayo Saka joins Harry Kane and Raheem Sterling in attack, meaning Phil Foden and Marcus Rashford start on the bench.
In defence, Southgate's shown faith in Harry Maguire, who has seen his game time limited from Manchester United this season. He partners John Stones at the back with Luke Shaw and Kieran Trippier on the flanks.
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Regular number one Jordan Pickford keeps his place in net.
Topics: England, Mason Mount, Football World Cup
Daniel Marland