With Pep Guardiola's character having been placed under the spotlight during his time at German giants Bayern Munich, the Bundesliga club's team doctor once accused him of being insecure and failing to understand the medical side of football.
Dr. Hans-Wilhelm Muller-Wohlfahrt has been the head doctor for the Bavarian giants for more than 40 years, having joined them in 1977. Since then, he has looked after famous athletes such as tennis legend Boris Becker and 100m world record holder Usain Bolt.
During his time in Germany, Guardiola grew frustrated at the fact that Muller-Wohlfahrt never attended matches or training sessions, but rather treated the players from his private clinic.
"Dr. Muller-Wohlfahrt's concept is very different (from Pep's). He did not believe that his presence on the training field was necessary, nor did he accompany the team for any league or cup games, although he did in the Champions League," Spanish football writer Marti Perarnau told The Athletic.
"For any check-ups, the players had to go to the doctor's private clinic, even the day before a game. For the doctor, it was essential to let the players recover very slowly."
The former Barca boss did not want cause conflict due to Muller-Wohlfahrt's reputation at the club, but relations between himself and the head doctor became so fractured that the latter resigned from his position in 2015.
The Bayern stalwart, who returned to the Bavarians in 2017 after Guardiola had left for Manchester City, even went as far as stating in his 2018 autobiography that the two-time UEFA Champions League-winning manager was unreasonable in his demands of medical staff and deeply insecure.
"(Guardiola is) a weak and insecure person who had absolutely no interest in medical matters; he demanded of us that we perform miracles," Muller-Wohlfahrt wrote in his autobiography, as cited by The Athletic.
Do you think the Bayern doctor was right to call Guardiola "weak and insecure", or do you think he was being unfair? Have your say in the comments section below.