The 40-year-old ex Manchester United star shared a picture of him training with young boys, reported People magazine.
"Nice way to warm up before the big game," Beckham captioned the photo.
Brooklyn, 16, is seen sitting beside his father, and 1D star Harry Styles can be spotted standing behind them.
The UNICEF Goodwill Ambassador will be returning for UNICEF Match for Children scheduled to be held on November 14.