They had a £22 million offer for the Tottenham playmaker turned down earlier this month, but had been hopeful he would move.
Having failed to convince the player, who is under contract, to leave his club, they have now made a huge offer for Palermo’s Argentine star.
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Chelsea have struggled to build momentum in the opening stages of the campaign and are currently looking over their shoulders at the relegation zone.
Who of Europe’s top strikers will move to England this summer?