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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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.