For every devotee of Pep Guardiola's footballing philosophy, there is a noted adversary; for every Thierry Henry, there is a Zlatan Ibrahimovic.
A polarising figure by sheer virtue of his determination to approach each and every element of the game in his own style, one of Guardiola's most vocal detractors has decided to release his autobiography.
Having fallen foul of Guardiola during the Catalan's spell at Bayern Munich, the reinstated doctor Hans Muller-Wohlfahrt has not shied away from his acrimonious departure from the club in 2015 in this damning memoir.
With extracts emerging in the German newspaper Bild, Muller-Wohlfahrt describes a figure "with low self-esteem who will do everything he can to hide it from others. ... He lives in a constant state of fear of losing his power and authority."
Recently, Guardiola (perhaps unbeknownst to himself) stoked the ire of Mino Raiola, the influential agent of Zlatan Ibrahimovic, among many others.
In a similar vein to Raiola's criticism, Muller-Wohlfahrt describes the contempt he felt from Guardiola's treatment of him and his profession:
Guardiola saw me as a subordinate that he could turn to at any time. On the one hand, he was not interested in medical issues. On the other hand, he expected authentic miracles from us.
Even during the Club World Cup in Morocco any observer could see that the Bayern players were not in shape. Guardiola did not pay attention to my reports on injured players.
Giving cause for the Bayern doctor to lose his temper on at least one occasion, the 75-year-old recalls how out of character this was for him:
I completely lost control, I yelled at him and hit the table that made the plates and cups clank. That was the first time in all my years of work that I yelled at someone.
Having previously accused Guardiola of being "negligent towards the medical profession," and only really interested in taking the pain away from players, not curing actual injuries, Muller-Wohlfahrt ultimately believes that his own "privileged position at the club" irritated the former Barcelona man to such a degree that "he took advantage of any opportunity to make me look bad."
Given that the German first joined Bayern's medical team in 1977, and has treated a whole host of impressive figures (sporting or otherwise) throughout a varied medical career, it is sure to be an interesting read.
Especially if his frankness about Guardiola is anything to go by.