Reports in Italy have suggested that Arsenal plan to make a January move for the Spain international.
But Marotta insists that the Spaniard is not for sale.
Marotta said in Tuttosport: “The player is not for sale, he has never been for sale, and he remains with us.
“There is great confidence in the boy, he is reaching top condition.
“We are very happy with him and with his progress.”
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.