From the BBC:
When Jude Bellingham scored England's opening goal of Euro 2024 on Sunday, he celebrated by dropping to one knee and covering his face with team-mate Trent Alexander-Arnold.
Real Madrid midfielder Bellingham, 20, headed in Bukayo Saka's deflected cross against Serbia, leading to his and Liverpool full-back Alexander-Arnold's peculiar celebration.
"When we play Wolf, one of the staff [England team photographer Eddie Keogh] always holds his face when he doesn’t have a clue what’s going on," Bellingham explained to BBC Sport after England's 1-0 victory.
"So that was a little group celebration for the Wolf crew."
But what is Wolf?
Wolf, or Werewolf, as it is also known, is a card game that requires at least seven players who will take on roles such as 'villagers' and 'werewolves'.
The basic premise of the game is for the werewolves to try and eat the villagers without getting caught, and for the villagers to try to survive - while catching the werewolves in the act.