There is no doubt that Jose Mourinho is one of the most emblematic and prolific coaches of the last 15 years.
The tactician's trophy cabinet includes the three Champions league titles, eight league titles - two Scudetto, three Premier League and two Preimier Liga - and many other cups and individual awards.
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Whilst few question Mourinho's past success, his critics have grown significantly in numbers over the past few years given his lack of success with star-filled Real, whom he managed for three seasons.
And the Portuguese's recent struggles at Chelsea haven't helped him to regain his reputation. Here we will take a look at his five biggest mistakes made this season.
1. Tolerating Diego Costa's misbehaviour
Costa is a high-quality striker; on his day perhaps even a world-class one. However, his on-pitch behaviour certainly doesn't suit the reputation of a Spanish international who plays at a major European club.
While referees have often missed or closed their eyes for Costa's outrageous acts on the pitch, there is little doubt that this is affecting his team.
Strikes thrown, simulations, cursing and manipulating opponents have become part and parcel of the 27-year-old's game and Mourinho hasn't done anything to calm his first-choice striker.
2. Radamel Falcao
What ever happened to the player who was once one of the most feared strikers in Europe, scoring for fun for Porto, Atletico Madrid and Monaco?
The Colombian looked like an amateur during his short spell with Manchester United and the faith shown by Mourinho was surprising and hasn't paid off in any way.
3. No major summer signings
Chelsea missed a huge opportunity to increase the gap between their title-winning squad from last season and their biggest rivals. In contrast, Manchester City signed Kevin De Bruyne and Raheem Sterling, Manchester United strenghtened with the likes of Anthony Martial and Memphis Depay and Arsenal signed Petr Cech, arguably the best goalkeeper in the Premier League.
Even a struggling Liverpool side have made major investments - and the results have been devastating for Chelsea. When your best summer signing is a second-choice goalkeeper (Asmir Begovic), you know it's a failed transfer window.
4. Stubborn tactics
The 'Special One' doesn't mix his game up enough. Despite the club's bad performances at the beginning of the season, Mourinho stuck with the same group of players in the same formation.
In comparison, Massimiliano Allegri has done a much better job with an injury-plagued and struggling Juventus side this season. Similiar to Chelsea, the Old Lady won the league comfortably last year, but the Bianconeri started the season in dreadful form.
However, Allegri's tactical adjustments made sure his men are still in the fight for top spots, which can not be said about Chelsea. If Mourinho keeps picking players like John Terry and Branislav Ivanovic, both of whom past their prime, in every game and occasionally using John Obi Mikel, Chelsea's poor form will never cease.
5. Failing to motivate his players
None of the aforementioned factors would matter if the Portuguese tactician was able to motivate his players. Eden Hazard, Willian, Cesc Fabregas, Oscar, Nemanja Matic and Ramires are all amongst the best players in the Premier League yet have shown very little to justify such reputations.
The fact that Mourinho's football has somehow resulted in his players performing so poorly this campaign perhaps suggests a new direction is needed.