Reports have suggested that Sanchez's move to the European Champions is all but completed after refusing to meet City to discuss terms this week.
But Gino Pozzo, son of Udinese president Giampaolo Pozzo, says a deal is far from complete.
"I can say that Barcelona have the advantage over Manchester City right now," Pozzo said.
"The player has not manifested any particular preference, although naturally we will listen to his opinion.
"We haven't concluded any deal yet because there are still some details to work through."
Barca have reportedly attempted to offer Spanish Under 21 star Jeffren as part of the deal to push the transfer through, but as yet no deal has been accepted.
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