And yet we know enough about it for Sakho to have broken squad rules on a number of occasions.
Unless you're insinuating that Klopp isn't telling the truth?
Not the first time either FMS
Sakho made his debut for the French side when he was just 17, and was captain by 21. However, according to Johnson, his star waned due to a combination of disciplinary issues, strained relationships with coaches and problems with diet, Sakho went from being indispensable to fourth-choice central defender, before departing.
According to Johnson:
"...despite those traits making Sakho a potential world-class defender, the Frenchman has some character flaws that were eventually too severe to overcome in Paris.
"His attitude, a lack of discipline including poor dieting habits and fractious relationships with certain members of staff, particularly in the early days, put his future at the club in jeopardy a long time ago. Many of his coaches were unhappy with his unprofessional demeanour, peaking with a nasty altercation with a journalist regarding his social habits, and PSG actually almost got rid of him as a teenager. However, at that time Sakho focused enough on his football to stay, although he arguably never embraced being a true professional."
"Sakho also had to deal with criticism from within the hierarchy; sporting director Leonardo remarking that he was "a bit overweight" when asked why he wasn't featuring in the first team towards the end of the 2011-12 season. Then PSG managed to snare Brazil captain Thiago Silva from AC Milan at high cost, meaning there was realistically only one place in the side that he could now expect to occupy."
Sakho maintained his cult status amongst fans, but new arrivals, coupled with coaches appearing to run out of patience, ultimately led to Sakho's departure as, according to Johnson, the player failed to "grow up."
"He has not regressed, but he has also not evolved into the player that so many predicted that he would become two years ago. That is largely down to his loveable, but at times debilitating immaturity.
"In essence, he needs to grow up. The move to Liverpool could be perfect for that, and if he does then the Reds have some genuine leadership material on their hands."