Marco van Ginkel's move to Chelsea could hinder his future development, according to Ajax sporting director and former Netherlands international Marc Overmars.
The Blues have struck a deal to sign the 20 year old from Vitesse Arnhem and he is expected to become the second signing since the return of Jose Mourinho as manager.
But Overmars, whose Ajax side were also understood to be chasing Van Ginkel, feels his development could be hindered with a move to Chelsea, despite Mourinho having reportedly promised the Dutchman regular first-team opportunities.
"Van Ginkel is a great young talent and we would have liked him to come to Ajax," Overmars said.
"Whether it is too early for him to go to Chelsea or not, I don't know. With us, he would have played a lot of games and played in the Champions League.
"We couldn't have a discussion with the player as Chelsea have a co-operation agreement with Vitesse and were first choice.
"The important thing for the player is that he gets minutes in the first team. Hopefully the deal goes well and he will get into the team."
Van Ginkel won the much coveted Dutch Football Talent of the Year award last season, a prize previously scooped by Christian Eriksen, Wesley Sneijder and Arjen Robben.
The mobile midfielder will be hoping for regular opportunities in his first season in the Premier League having seen, among others, Belgian trio Romelu Lukaku, Kevin de Bruyne and Thibaut Courtois spend lengthy spells out on loan.
Chelsea's relationship with Vitesse, formed by a bond between club owners Roman Ambramovich and Merab Jordania, meant the Europa League winners always led the pursuit of Van Ginkel.
The likes of Nemanja Matic and current youngsters Tomas Kalas, Patrick van Aanholt and Gael Kakuta have all spent loan spells at Vitesse in past years, but Van Ginkel, who played in the Under-21 European Championship for Netherlands and made his international debut back in 2012, will hope he can build his reputation at Stamford Bridge.