Rabbi Matondo is expected to move to Schalke for just under $16 million.
The 18-year-old represents the third player from City’s youth academy to move away from the club in the last two years.
The club are said to not be as concerned by Matondo’s move as he is not near the quality of displacing Riyad Mahrez or Bernardo Silva.
“Yeah, I have some comments – I know how good he is, incredibly fast winger, and a young talent. This club is working so good. All the players in the academy, we trust them. If they want to be patient and stay; if they want to leave, they leave,” said Guardiola.