The 27-year-old recently admitted that he had been speaking to the Red Devils over a possible move to Old Trafford.
Moratti has stated that he is even more adamant the Dutch midfielder is staying put in light of a potential move to Anzhi Makhachkala for Samuel Eto'o.
"Sneijder away? For Wes there has never been any sort of negotiation," Moratti told La Gazzetta Dello Sport.
"If Eto'o leaves, he remains. Sneijder was untouchable even before this hypothesis, now it is even more so. Sneijder will remain."
Meanwhile, United are preparing for their Premier League match against Tottenham at Old Trafford on Monday, August 22.