Ajax sporting director Overmars was also asked in-demand star Donny van de Beek.

Van de Beek has been linked to Manchester United and Real Madrid, though Barcelona are believed to be eyeing the Netherlands international following Koeman's appointment.

"No idea, at least that hasn't made it onto my plate yet," Overmars said when quizzed on Barca's rumoured interest.

Overmars added: "It's pretty quiet. I certainly think the market has yet to get going. That makes sense: the Champions League has only just ended, so that will start soon. 

"There is always interest for some players. A few players look good, one player has fairly serious interest. Who that is? That will show itself in the coming weeks."