I normally don't easily say a player is finished, but for him it is very hard for me to see him not getting worse even from here. What he used to be good at is ball playing and helping on distributing, and defensively his timing and anticipation was extremely well, as long as you don't expose him to a 1 on 1 situation with no cover, he is good, but now he still kinda arrives on time (sometimes he even makes weird decisions), but he seems incapable of intercepting anything, nor can he even pressure the one on the ball.
Almost feel like Frog is better than him now, at least in the defending area.
Point is I don't think he will get any better, even if he comes back fresh next season, unless he suddenly becomes stronger without sacrificing his speed and agility which aren't exactly impressive to start off with, also with age these 2 attributes can only get worse.
Reminds me a bit of Cambiasso in his later days, the brain is there, but the body is starting to drag him behind; not saying de Virj is there yet, but it is starting.
With that said, I can still be horribly wrong, as he can just be distracted by his personal shit.
Still I would rather sell him if possible, especially with Sunning fucking our club like this right now.