The 18-year-old has impressed in the Premier League this season and recently signed a new five-year contract with the club.
Kean said: “It’s going to be difficult for Phil but we are confident.
“This is where he started, where he got his first chance and we believe we have rewarded him very well.
“He wants to play as high up the league as everybody else does and he’s a star in the making.
“He’s on a five-year contract and if we can sit down at the end of the season and discuss what players we are trying to bring into the club then hopefully we can keep the big hitters away.
“We want to sit down with all the younger ones and explain what we want to do as a club over the next two, three or four years and if they stay with us they are going to part of that story.
“If they decide they want to move on then the clubs concerned will have to pay top dollar because they are under very, very long contracts and the fees we would be demanding would be massive.”
