Former Chelsea striker Romelu Lukaku says team-mate John Stones would be making a mistake if he leaves Everton for Chelsea.
The Belgium international spent three seasons at Stamford Bridge but never managed to enjoy regular first-team football at the club.
He was loaned out to West Bromwich Albion and Everton before making his move to Goodison Park permanent.
And he has warned his team-mate not to throw away a solid role he is enjoying at Everton.
"John is in a good situation at a good club that believes in him," Lukaku told The Guardian.
"He is playing and learning a lot from Phil Jagielka. He's been here two years now but this is the year when he needs to confirm he is the top player he can be.
"This club has massive potential with the players we have and the ambition the manager has. He is on to a good thing. We are young but we have a lot of potential.
"We had a great first year when I came here and last year was very, very tough but we will learn from it. The Southampton game showed that.
"John is in a good situation and he needs to keep doing what he's doing. He also has the Euros coming up [with England]. Why go?
"I made the decision to leave [Chelsea]. I chose.
"I thought: 'I'm 21, what is going to happen now?' I could easily have stayed at Chelsea to fight for my place but I didn't know what the manager's ideas were with me and I didn't know what the club's plan was for me.
"Here the plan was clear – bring young players over, grow them into top players and win titles along the way. I saw myself as part of that, so that's why I signed here on a permanent deal."