The England midfielder is a target for Europe's biggest clubs, including Liverpool, Bayern Munich and Tottenham.
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Blackburn Rovers are due a 15 per cent cut of profit over the £18m Palace paid for Wharton in January 2024.
But The Sun says Wharton is happy at Selhurst Park and willing to stay another season.
The Eagles are desperate to keep hold of Wharton, as offers arrive also for Ebere Eze and Marc Guehi.