The Chile international is reported to be attracting interest from some of Europe's top clubs after starring in Serie A.
Manchester City, Real Madrid and Bayern Munich are all said to be admirers of the talented 25-year-old, who moved to Italy in 2011.
Juve, though, have been quick to point out that they are under no pressure to cash in on key men.
General director Beppe Marotta said: "We are not a club that sells. Last season there were big requests as well, but I repeat, we are not sellers."
Meanwhile, Paul Pogba's agent has responded to rumours suggesting that the Juve midfielder and his fellow Frenchman M'Baye Niang of AC Milan are summer transfer targets for Real Madrid.
Mino Raiola told Tuttosport: "If (Florentino) Perez wants them, he has to call me. He has to deal with me.
"Real are not the only ones, there are clubs all over the world that would like Pogba and Niang.
"Nowadays there are no contracts that can tie a player to one club. Nobody is bulletproof when you're appreciated all over the world."