He told the players: “Charlotte wanted me to tell you that she is very good at goal.
“She said, ‘Can you please tell them,’ and I said, ‘Okay, I’ll tell them’.”
He previously told a young player that George prefers Charlotte to play in goal “because he says he’s better,” prompting him to tell his eldest son, “Charlotte can be just as good as you, George, so give her the same chances.”
The Cambridges have been on holiday during the football tournament this year, but have reportedly watched games at home.
The social media video is a rare appearance for the princess online.
The Duke had his arm around her for the short film, with her confident delivery immediately acclaimed by fans.