Speaking on the BBC's Wayne Rooney Show, the former England captain said: "We were watching the Arsenal game and Dowman comes on and and Kai has played against him, and I said, 'Is he your age?' And he went, 'Yeah'. Kai is two months older than him!
"It's actually crazy that he's playing first-team football in the Premier League. He [Kai] just said, 'You can clearly see he's a top player.' And for any young player, you say, you work hard and put the effort in and you never know.
"Sometimes you could be playing Under-15s and next time Under-18s or Premier League."