No way he is worth 15 M now with one yr left in his contract. Not to mention he is injured and out for a few months. If Arsenal can get 7 M for him, they should take it. Having said that, he can rebound nicely at Marseille. He is the type of player that can do well with Sampaoli.
7m? Nah, c'mon. We paid more than that for him when he was in Ligue 2! He's played in the PL, he's France U-21 captain. He was valued at 40m not long ago! We're not getting close to that obviously, and prices are deflated in this market, but 7m is way too low.