Jose Mourinho came in for criticism from a number of Bayern Munich officials earlier this month for his treatment of Bastian Schweinsteiger.
The Portuguese tactician, renowned for his ruthless managerial approach, relegated the Manchester United veteran to the Under-21's dressing room in late July having deemed him surplus to requirements.
Where Schweinsteiger's future lies remains to be seen but one thing is for sure: it isn't at Old Trafford.
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Bayern soon responded to their former player's humiliation in Manchester, with president Karl-Heinz Rummenigge expressing shock at Mourinho's behaviour.
He said: "When I read that I couldn’t believe it. Players should think twice before signing for clubs who treat them like this when they're no longer wanted."
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Former Bayern manager Ottmar Hitzfeld also waded into the debate: "It's a lack of respect for a worthy player.
"It's a method which is strange to me. Schweinsteiger is a key player, a world champion, a personality, while at the same time he has an exceptional attitude."
In a press conference ahead of his side's meeting with Hull City on Saturday, Mourinho responded to the above and was typically sarcastic.
He said: "I thought after quotes from Bayern they would run to Manchester to bring him back," before adding it would be "very difficult" for Schweinsteiger to play at United.
Mourinho 1 - 0 Bayern.
Schweinsteiger looks set for a frustrating season at Old Trafford, then, after Mourinho also hinted that no players will be leaving or arriving before the transfer window's close on August 31.
"I have 23 players in the squad and, in principle, there is nobody leaving and nobody is coming," the former Chelsea manager continued.
"It's more than enough and if you have a problem or an opportunity then I have a few young players in the Academy that I will be more than happy to give them an acceleration in their process."
This follows on from Schweinsteiger admitting he won't be joining another European club as of when he leaves United.
He said, per Sky Sports: "MUFC will be my last club in Europe.
"I respect other clubs. But Manchester United was the only one which could make me leave Bayern Munich.
"I will be ready, if the team needs me. This is all I can say about my current situation. I want to thank the fans for the amazing support over the last few weeks."
A sad end to an incredible career.