His agent says it's the redemption clause. But either way if they are in a weak financial position they probably need the full €9.5m from Juve rather than a p/e and Isla with his salary on top.
Since i just remembered he's still our player, how he's doing?
Transfermarkt says he's injured since Apr 11 (harmstring) and that he mainly played as a DM for Marseille.
He did very well and was used as CM in a 2 man midfield but Marseille are too broke to buy him,, he's destined to another loan and then his contract will expire ala Malaka