Real Sociedad, Alexander Isak's former team, could be in line for a windfall this summer.
The Swedish striker is in line for a move to Premier League giants Chelsea this summer.
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The Magpies want to hold onto Isak, but have no European football to offer.
Per El Diario Vasco, Sociedad are hopeful that Newcastle will eventually accept a bid from Chelsea.
The Spanish side negotiated that 10% of the profit from any sale would come to them.
Such a sum would be a huge windfall for a club that has modest finances at present.