Chile international Sanchez, 22, has been linked with a number of top clubs around Europe, but Manchester City now appear to have given up their pursuit and Inter and Juventus look to be leading the race for his signature.
Moratti told Inter Channel: "It's hard to give a precise reply at a moment in which we are trying to figure out if the clubs will sell, how they will sell, the prices, wages and whether certain exchanges will be able to be made.
"However, let's say that the player with whom we are speaking, and I don't know the odds of our success, is certainly Sanchez, because we've been talking about it for a long time. Also because he's a player with many qualities and because we've opened a certain kind of discussion with Udinese.
"Let's say not that he's definitely coming but [that] there is a 60% chance that he will arrive."
Inter were among the clubs said to have expressed an interest in Argentina playmaker Pastore but, with Palermo demanding €50 million for his services, it appears Moratti is not willing to enter the bidding.
"We all know that Pastore is excellent, he also played well against us in the Coppa Italia final, but I don't think that negotiations are possible," he said.
Inter have been linked with Roma vice-captain Daniele De Rossi, who has a lifelong association with the city and is considered an icon of the club, and Moratti was equivocal about his hopes of signing the player.
"De Rossi, in my opinion, is not a bad idea at all, but I don't believe we have initiated any kind of negotiations with Roma, also because the club is going through a re-organisation," he added.
"I do not think there are such contacts to be able to study what can be done, and then there's the fact that the player is tied to his club and especially the city, but I too consider him a player of great quality and character, and therefore I don't think for him to have an experience with us would be a bad thing..."