The 27-year-old has been one of the Red Devils' top targets this summer, with a £42.5 million bid being prepared, and Goal understands that Vidal met with his agent and senior officials on Sunday evening to discuss the possibility of a transfer to Old Trafford.
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Marotta told Sky Italia: "We have clear ideas. We renewed [Vidal's] contract a few months ago just because we knew we could count on an important element.
"We don't want to sell Vidal, there are only rumors because he is a player among the best in the world. We never activated a clause to try to sell him - if he doesn't show an intention to leave, our position won't change."
United had hoped to tempt the goalscoring midfielder into a move to the Premier League by offering a wage package of £250,000 per week and had made the Chile international one of their key targets this summer as Louis van Gaal's overhaul begins to take shape.
Despite United's interest, though, Vidal looks almost certain to remain with the Scudetto holders.