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#3 Making unproven allegations against referee Anders Frisk (2005)
Following their elimination from the FA Cup to Newcastle United, Chelsea turned their attention to the Champions League and came up against the might of Barcelona in the Round of 16.
They fell to a 2-1 defeat to the Catalans in the first leg at Camp Nou, with Barcelona coming from a goal down in the first half after star striker Didier Drogba was sent off for two bookable offences.
This ruled the Ivorian out of the second leg (which Chelsea won) and prompted Jose Mourinho to launch a scathing attack on the integrity of match referee Anders Frisk, claiming the red card was issued after he invited Frank Rijkaard to his room for 'a meeting' during half-time.
At the time, Andres Frisk was the most highly-regarded referee in the world. Following the allegation, however, the official and his family were subjected to several death threats. His reputation was also called into question, leading him to prematurely announce his retirement at the age of 42 just three weeks after this fixture.
Of course, Jose Mourinho never gave credible evidence to substantiate his extraordinary claim and he was given a two-game touchline ban by UEFA, as well as a £50,000 fine.
#2 Falling out with marquee players at Real Madrid, Chelsea and Manchester United (2011, 2015, 2018)
Jose Mourinho is many things to different people and while his no-nonsense and demanding attitude might win him plenty of admirers, it also gives him a lot of bad press.
This is perfectly manifested in his relationship with his players and while some- like those at Inter Milan and those who played for him during his first spell with Chelsea- praise him to the high heavens, the Portuguese manager infamously fell out with some of the biggest names in the dressing room at Real Madrid, Manchester United and during his second spell at Stamford Bridge.
Footballers have some of the biggest egos in the world and names like Cristiano Ronaldo, Eden Hazard, Sergio Ramos, Paul Pogba, Iker Casillas and Marcus Rashford are among those who had bad blood with Jose Mourinho.
These fallouts led to him losing the support of the dressing room and played a major role in his acrimonious departures from each of the aforementioned clubs.
#1 Not giving younger players a chance earlier in his career
Jose Mourinho's fixation on getting ready-made players primed to deliver instant results has seen lots of promising youngsters fail to get regular playing time, leading them to consider their futures elsewhere.
This was especially true across his spells at Chelsea. Despite possessing one of the best academies in the world and winning several titles at youth level, the players failed to make the step-up and were consequently loaned or sold elsewhere.
Romelu Lukaku was unceremoniously discarded in 2013 without getting adequate opportunities and the folly of this decision was evident when Jose Mourinho signed him four years later for a record-breaking fee at Manchester United.
Others like Kevin de Bruyne and Mo Salah have gone on to become bonafide world-class players who are key players for Manchester City and Liverpool after being discarded in their youth by Chelsea.
