Kevin de Bruyne has hailed Jadon Sancho's meteoric rise from Watford youngster to Borussia Dortmund superstar.
The England winger came through the academy at Manchester City after moving there from Watford when he was just 15.
A CIES study recently rated the England international as the most valuable youngster in world football, calculating his worth to be £184 million.
Sancho has 27 goals and 37 assists in 69 Bundesliga appearances for Borussia Dortmund.
He has consistently been linked with a return to the Premier League with Chelsea, Liverpool and Manchester United all interested.
"He is crazy," De Bruyne said on a live Q&A on Instagram with international team-mates Axel Witsel and Romelu Lukaku.
"It's weird, I trained a few times with him and he was gone. Unbelievable. Sometimes it goes like this, but it is good for him.
"Now if you want him you have to pay...I don't want to know!"
- TEAMtalk media