Maurizio Sarri has told Callum Hudson-Odoi to stay at Chelsea and become "one of the most important players in Europe".
Hudson-Odoi has now made his senior England debut before his full Premier League bow, but Chelsea coach Sarri insists he has the highest hopes for the teenager.
The 18-year-old's Chelsea contract expires in the summer of 2020 and the Blues rebuffed a £35million bid from German giants Bayern Munich in January.
Chelsea want to finalise a new long-term deal for the forward by the end of the summer.
Asked if he expects Hudson-Odoi to be at Chelsea next term, Sarri said: "I think so. I'm not able to say if he's going to sign a new contract or not, but I think he will stay here with us in any case.
"Probably, in the near future, he will start in 75 to 80 per cent of matches.
"He is doing very well, but he needs to improve more because the potential is really very high. And so I don't want him to stop improving. He can become, I think, one of the most important players in Europe."
Hudson-Odoi's father Bismark and brother Bradley act as his advisors, with Bismark the Chelsea star's registered agent.
Chelsea are keen to keep negotiating with a view to securing their prize asset on a new deal, and are understood to be outlining all of the positives that would accompany blossoming into a genuine superstar at his boyhood club.
Chelsea play at Cardiff tomorrow as the Premier League returns as Sarri also insisted the player is ready for his full Premier League debut.
"We have to play eight matches in 28 days, and so I am sure that Callum will start in two or three matches," added Sarri.
"I'm really very confident in him. He has started a lot of matches, not in the Premier League, but that's by chance.
"I can play with only two wingers. We have Eden Hazard, Willian, Pedro, so it's not really very easy to start in every match here."