​Bayern Munich doctor Hans-Wilhelm Muller-Wohlfahrt has lashed out at former boss ​Pep Guardiola in his new autobiography, revealing that he has "weak self-confidence and lives in constant fear".

Muller-Wohlfahrt had been with the German giants for more than 35 years at the time of Guardiola's appointment in 2013, but the pair did not enjoy the best of relationship, clashing frequently on issues ranging from treatment methods to the doctor's refusal to attend training sessions.

The club's 3-1 defeat to Porto in the first leg of the quarter-final of the Champions League in 2015 saw controversy erupt, with Muller-Wohlfahrt and three of his staff members resigning following claims that they were being held responsible for the defeat.

While he is now working with the club in a different capacity, the German still does not seem impressed by the methods and attitude of the Spaniard.

"I think Pep Guardiola is a person with a weak self-confidence who does everything to hide that from other people. Because of that he seems to live in a constant fear. Not so much of defeats but of the loss of power and authority," ​Muller-Wohlfahrt said in his autobiography, 

Seeing with your Hands: My Life and my Medicine, an extract of which was published in the German publication, Bild.

"He knew everything better: Five minutes warm-up had to be enough. But that couldn't end up well. Apparently he saw me as a receiver of commands whom he could order every time he wants."

Guardiola was manager of the Bavarian giants between 2013-2016 winning 82 of the 102 games he was incharge of, leading the club to three Bundesliga titles and two DFB-Pokal trophies.