Prince William shares joke about Prince George, Princess Charlotte and Prince Louis

After impressing the professional players with his efforts on the pitch, William could not resist making a cheeky comment about his sporting ability.

When he was given three mini balls to take home for his three children, Prince George, 11, Princess Charlotte, nine, and Prince Louis, six, as well as a full-size one for himself, he laughed: "I’ll do some practice at home and see how many windows I can smash."

The royal joined a community event in south London hosted by the NFL Foundation UK, a charity that works with young people in deprived areas.

It uses NFL Flag, a non-contact version of American football, to engage teenagers and help change lives.

The prince was wearing a very bright pair of trainers with his suit for the visit.

William's shoes, thought to be Toms, appeared in a pristine condition.

The Prince of Wales had a go at several throwing drills before taking to the pitch as a quarterback.

Louis Rees-Zammit, a former Welsh rugby player who recently switched to NFL, was impressed with his skills.

"He can throw the ball," he said. "He can throw the ball better than me. He can get a good spiral on the ball as well, not like me!"

Phoebe Schecter, GB women’s flag football team captain, added: "His arm strength is incredible. I could not believe how far he could throw the ball. He did a great job. Very coachable."

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One activity involved throwing the ball into one of several small holes in a large net.

After getting some advice on how to stand and how to hold the ball, William missed his first shot but was elated to get his second in the net.

There were jubilant high fives all around as he joked: "One out of two’s alright. I’ll retire on that. That’s my NFL career."