Trade Nene as soon as possible. Th more this decision will be delayed, the higher the risks.
It does not matter if he plays well or not because that is by no ways the most important.
He has the highest salary in the team and is unable, or unwilling, to produce a constant effort. No team can have serious ambitions with such a player.
I think that he is not respecting the other team members and that his very poor attitude will destroy the team´s chemistry sooner or later and create problems that cannot be repaired.