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Hakim Ziyech has impressed for the Blues since joining from Dutch club Ajax.
According to Ajax chief Edwin van der Sar, Ajax is honoured when European giants like Chelsea buy their players because it means they are doing something right.
Speaking to The Athletic, Van der Sar said: “We know the ambition of the players and if our players are not good enough to be scouted by the top clubs, then we are doing something wrong.
“If Chelsea hadn’t scouted Hakim Ziyech, we’d have done something wrong.
“It sounds strange but we are almost honoured if Real Madrid, Barcelona and Manchester United are coming for our players.
“Of course, I’d rather keep them but, having been a player myself, if you give us great service, league titles and commitment, then we think with you and set you along for the next part of your career.
“But we hope that you come back to Ajax and play for another one or two years, come onto our coaching staff or be like myself and Marc [Overmars – the club’s football director].”