According to Gazzetta dello sport a deal for Isla is still possible. Juventus wanted about 7.5 million euros for half the player around the 20th of July, and Inter offered 6.9. Isla himself wants to join Inter and the clubs will most surely discuss a deal again. The key for the deal is whether Juve manages to sign Zuniga or not. If Juve will get Zuniga, Isla will surely come to Inter.
Source: Fcinternews.it