Maurizio Sarri says Callum Hudson-Odoi will not leave Chelsea this month.
The 18-year-old has reportedly handed in a transfer request, amid interest from Bayern Munich.
The Bundesliga giants have lodged four bids for the talented winger, but Sarri says he is going nowhere.
Speaking ahead of Chelsea's Premier League game at Bournemouth on Wednesday, Sarri said of Hudson-Odoi: "On the pitch, he's doing very well. I'm really very happy with him.
"I'm not very happy with the situation, but I know very well that every big team here in England has the same problem.
"It's not easy to keep these young players. He is of course one of the best 18-year-old players in Europe, so it's very, very difficult.
"The club told me he's out of the market for sure and probably he will be out of the market in July. He's improving. I think he'll be the future of our club. He will be the future of English football."