Cassiano Pereira has poured cold water on the link, which has stated the Sao Paulo club were "optimistic" of getting Rafael at the end of the season.
"I see it as being quite difficult [signing Rafael].
"He's a starter, despite having been injured [and] nobody at Corinthians has talked to me.
"Suddenly, there is interest. If there is, it's great. All third parties and players see Corinthians very positively, but it's hard, because he is happy at United.... He is not even thinking about returning to Brazil."