Pep Guardiola is the subject of a scathing attack made by Bayern Munich and Germany doctor Hans-Wilhelm Muller-Wohlfahrt in his new autobiography. On the one hand, he was totally uninterested in medical issues, but on the other hand, he demanded that we perform miracles.
The two men engaged in a ferocious dispute over the treatment of Thiago Alcantara, which ended with Guardiola sending the midfielder to Barcelona, to be treated by Ramon Cugat.
There was also an infamous incident in which Guardiola was caught sarcastically clapping Muller-Wohlfahrt after Mehdi Benatia sustained an injury during a game against Bayer Leverkusen.
All that, though, appears to be just the tip of the iceberg in a deep-running feud between doctor and coach.
Now back on Bayern's payroll, Muller-Wohlfahrt has delivered a vicious attack on Guardiola, claiming that the Catalan took against him from the moment he arrived.
He said Guardiola "wasn't interested at all in medical matters", but "expected medical wonders from us". He said: 'What is going on here?
But now Muller-Wohlfahrt has claimed the injuries were not his fault, but Guardiola's.
"I remember one season under Jupp Heynckes, in which there were only three muscle injuries".
'Guardiola was often portrayed in the media as an innovative, if not revolutionary, coach.
"A reason why Bayern Munich has become so successful is because of its exceptional medical department which Muller-Wohlfahrt was, and is responsible for again now".
'In his first season, we had many more muscular injuries than before. He thought he knew better on everything.
"Five minutes warm-up in a rush, that had to be enough". It was never going to go well'.
According to Muller-Wohlfahrt, Guardiola - the former Barcelona coach - had told him: "It can not be that injuries here last six weeks but in Spain only a fortnight".
He describes one argument in which Guardiola slammed his fist down on the table. I couldn't believe that someone who had been alive for less time than I had been in the job wasn't listening to me'.
Müller-Wohlfahrt and his team left the club in April 2015, with Guardiola having blamed the doctor for Bayern's 3-1 Champions League defeat to Porto earlier that month. 'I think Guardiola is someone with weak self-confidence, who will do anything to disguise that from people. "He therefore seems to live in constant fear, not so much in defeat, but much more in the loss of power and authority".