Club president Josep Maria Bartomeu says the winger will not be going anywhere this summer despite reports linking him with Juventus.
The Chile international has had a productive year at Camp Nou, scoring 19 goals in 34 league games, although question marks remain over his long-term place in the side due to competition for places from Pedro, Lionel Messi and Neymar.
The Chile international has long been a reported target for Juventus, which is looking to bolster its wide attacking options as it prepares to switch its tactical approach from a 3-5-2 to a 4-3-3, but Bartomeu insists the 25-year-old will not leave.
"He's not for sale," Bartomeu told El Mercurio. "He has a contract with us and is an important part of the squad. I know nothing about interest from Juventus. No one has made an official offer. Sanchez has had a great season and, of course, will be a part of Barcelona next season as well."
The 51-year-old also talked about the reported interest from his own club in Juve midfielder Arturo Vidal.
"These are just rumors. Personally, I know nothing about that," he added.