Sunderland could price Jeremain Lens out of move back to the Netherlands, according to reports in the player's homeland.
According to Dutch news outlet AD, Feyenoord are keen to add Lens to their ranks in the summer, having recently been crowned Eredivisie champions.
But the reports claims that the fee wanted by the Black Cats for the international forward could make a deal difficult to do for De Kuip boss Giovanni van Bronckhorst.
As well as that, the wages Lens is on at the Stadium of Light could also be the biggest barrier.
The report states: "Perhaps that's why the name of an established value like Jeremain Lens falls into the Kuip. Whether it's real is just the question. Sunderland will never beat him under the six million euros and, moreover, the current annual salary of the attacker is so high that Feyenoord could not even pay a quarter of it."
Despite not being out of contract this summer Lens seems almost certain to leave the club.
He was farmed out on loan at the start of the campaign, but has enjoyed rave reviews for some of his performances at loan side Fenerbahce.
Fener are understood to be keen to sign Lens, who has also been linked with Galatasaray in Turkey.