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Everton may have to pay as much as £40m to land Gylfi Sigurdsson this summer.

Ronald Koeman is targeting the Swansea City playmaker this summer after having an offer rejected last July.

But Everton face a fight to sign him with the South Wales club insistent they don’t want to sell the Iceland international.

Swansea knocked back Everton’s £25m approach last year and a £30m enquiry in January from an unnamed Chinese Super League side.

The Swans’ resolve has now seen Sigurdsson’s valuation at the Liberty Stadium rise towards £40m.

Swansea’s US shareholder Steve Kaplan said at the end of the season: “We all know how important Gylfi is, just as he knows how much he’s valued and loved here.

(Image: Christopher Lee/Getty Images)

“There’s been interest in him before – there were some pretty big enquiries about him last summer and in the January window – but we didn’t want to sell him then and we don’t want to sell him now.”

Everton signed Ajax captain Davy Klaassen for £23.6m on Thursday while also sealing a deal for Sunderland goalkeeper Jordan Pickford, which could eventually rise to a club record £30m.

But the Blues look as they will have to break their club record transfer fee of £28m in order to land Sigurdsson.