Based on how JVS has spoken in recent times I'd say it's looking unlikely they'll return, Sokratis especially given his age. Those 2 lads clearly have egos, not something foreign particularly in Greek football and the Ethniki. Now whether they change their ways and buy into what the NT is trying to build I don't know, I think Manolas is more likely given his age but then again he may just think it's not worth the hassle. It seems quite a few of the public in Greece have turned on them, and have linked our improved performances of late with their absence. Where there is smoke there's fire, they clearly where causing issues but at the same time no one can deny they are quality players who would be welcomed back with open arms if there was an attitude improvement.
Unfortunately football isn't about just turning up, playing and going home. There is dynamics in the locker room, team morale senior players with a grudge can potentially poisoning younger generations. As much as I'd like to see it, I can't see them coming back anytime soon.