Dutch newspaper De Telegraaf claim on Monday that Everton are tracking Ajax defender Toby Alderweireld, but no official bid has been made yet.
It is understood that Everton have scouted Alderweireld and also been in contact with his agent but the Toffees are yet to make a formal offer.
This follows Alderweireld’s decision last week to reject an approach from fellow Premier League side Norwich.
Everton could sign Alderweireld for a fee of around 8 million euros, according to De Telegraaf.
The 24-year-old defender, who has also been linked with Liverpool, has one year remaining on his current deal at Ajax, but would be open to extending with Frank De Boer’s side.
Alderweireld is quoted saying: “If I do not leave, I am happy to sit down with Ajax to see if we can come to some agreement.”