The midfielder, who can also play in defence, made his senior worldwide debut in the current global break, and didn't look out of place against the world champions during the Netherlands' 2-1 loss to France on Sunday night.
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The Lilywhites, who ended the summer window without any incomings, have a concrete interest in signing De Jong and are understood to have made contact with Ajax last week.
"Barcelona can return in January if they want, but no player will leave", he is quoted as saying by AS. After returning to the Champions League group stage this season, the former European champions are determined to retain their squad as they try to reach the knockout phase. The English club Tottenham Hotspur also came with a bigger offer but Ajax kept a similar stand.
De Jong, who made his senior worldwide debut for Holland earlier this month, played the full 90 minutes as they lost to France in the UEFA Nations League on Sunday evening. So, Overmars has made it clear that De Jong will not be allowed to join Barcelona in the middle of the season.
However, Overmars is adamant de Jong will not be leaving the club, even if Barca were to make an improvement on Tottenham's offer.