Have seen another piece elsewhere suggesting there was a fall out between Coach and player last season that has directly lead to the current scenario with Ozil not being selected at any level.
The article alluded to some comments made by Ozil when he was subbed off in the Europa Final. However I also recall there to have been at least 1 other time when Ozil was supposed to have made a comment under similar circumstances along with the throwing of his jacket, although at the time it was not clear who the comment & jacket were directed at.
What seems of interest is both alleged comments (if correct) correspond with what is now being said in the press and in here - that Emery is not a Head Coach and that he is a coward in terms of his tactics and selections.
Whilst there may be an issue regarding Ozil not fitting Emery's requirements, perhaps the bigger issue is a clash of approach/opinion between Head Coach and a senior player off the pitch as much as on it.