Manchester City boss Pep Guardiola is reluctant to say if Ajax pair Matthijs de Ligt and Justin Kluivert would be mistaken leaving this summer.
De Ligt is a £50m target for City, while Kluivert has been linked with Manchester United.
Asked if the pair could be leaving Ajax too soon in their careers, Guardiola told Ziggo Sport: "It's difficult for me to give advice on that, one kid is different to the other, eighteen, nineteen years old, but it's hard to say 'no' to good contracts and salaries.
"Let's do it gradually. It's not easy for them, but it's different for everyone, I cannot give advice on that."