I don't understand the massive love for Bastian (poor lad etc). Yes, it's BFS, but he really left us for worse last season.
1) Basically unfit for the entire year. Rarely lasting 90 minutes. Niggling injuries here and there. Missing key games.
2) Follows his wife to all her Tennis matches when he should be recovering from his injuries (logically this would be at Carrington).
3) Spends the summer with the Germany squad, seemingly fit for the entirely of the Euros and playing considerably better.
Yeah he's a nice guy on Twitter and was a fantastic player in his prime but right now he's an injury prone midfielder who didn't give his all last year and was seemingly unfit when we needed him. Then he's suddenly fit to represent Germany in the euros.
He was extremely unprofessional with us last season.
Regarding the contract, he has every right by law to stay here for 2 years and collect his salary.
Mourinho is the new manager, it is really common for new managers to have certain players from the old regime that don't fit their system. Bastian is one of those players. He can neither play the deep lying defensive midfielder, nor the box to box role. So he's useless for Mourinho's system, hence him being out of the squad.
If you will not use a player for matchdays, it is useless to have him around the squad. Even if its in good faith, it causes unneeded tension and unrest. So the club has every right to send him to the reserves and make him train there.
Also regarding Bayern related comments, its standard point-scoring, if they're that heartbroken about the situation and can't stand to see Bastian being treated like this, let them sign him and pay his wages whilst not using him.