June 3, 2013 saw the self titled 'Special One' return to Stamford Bridge.
Jose Mourinho signed a four-year deal at Chelsea, marking the start of his second spell at the club six years after leaving. In his first spell, Mourinho led the Blues to two Premier League titles, one FA Cup and two League Cups.
Upon his appointment for the second time, the Portuguese had a strong message for Chelsea fans.
He told Chelsea TV: "I promise exactly the same things I promised in 2004, with this difference to help - which is I'm one of you."
He added: "In football, in my career I've had two great passions, Inter and Chelsea, and Chelsea is more than important for me.
"It was very, very hard to play against Chelsea and I did it only twice, which was not so bad."
At first, it was a success. One more Premier League title and League Cup followed, however, as detailed by David Chidgey for football.london when Mourinho lost his job at Manchester United, the 2015/16 season didn't quite go to plan.
"The causes are remarkably similar: publicly decrying the Manchester United board for not providing him with quality players, falling out with and humiliating individual footballers in the media and wearing the demeanour of a bulldog chewing a wasp.
"It was all too familiar to Chelsea supporters who remember his equally toxic meltdown at the start of the 2015/16 season. United's fall from second place in the doldrums this year has been something of a rerun."
But what went wrong at Chelsea? Chidgey had some theories.
"When Mourinho first breezed in to Chelsea he had a captive audience in a squad of players who had not experienced success. They put their egos aside and bought into his methods and a promise that he would make them world beaters and legends. He succeeded.
"Judging by the combustible relationships Mourinho has had with key figures in the dressing rooms at both Chelsea and United, his man management should also be questioned. Perhaps players earning several millions a year, aware of their own commercial value and power at these club, and with egos to match, are simply not prepared to take his authoritarian 'my way or the highway' approach."
There was also a simple message to Manchester United fans.
"I wish him well and hope that he can rediscover the 'Jose Mourinho' Chelsea supporters fell in love with and knew over ten years ago.
"In the meantime, having seen the downside of Mourinho's management at Chelsea in 2015, I can't resist a chuckle at the chaos he has created at Manchester United.
"After all, we did warn them"
That warning was there before the Red Devils parted company with Mourinho.
"Seeing him for what he is, without blue tinted glasses I used to wear, it is clear that the boxes that were ticked off by the Portuguese's behaviour on his way out of Stamford Bridge on the two occasions he was sacked are now being filled in again.
"Added to the complaints about the club not spending enough money we have already had the jibes at opposition clubs and managers, and not the usual run-of-the-mill moans that come with every manager. We all know Mourinho's way and what he's trying to get at.
"There has been the habitual blaming of referees for poor or unfair decisions too. When he was at Chelsea he criticised the home fans for a perceived lack of support – he has done the same at United.
"Most telling he has also been quick to dig out some of the players publicly, claiming that they are children incapable of making adult decisions on the pitch. Last season he questioned their character and bottle for refusing to play through injury. Add to this the ostracising of players he simply does not fancy."
The issues mentioned above led to Chelsea parting company with Mourinho in December 2015, after a 2-1 defeat to Leicester City. After the match the manager said he felt 'betrayed' by his players.
He told Sky Sports: "We conceded two goals that are unacceptable. My best qualities are to read the game for my players, every detail about the opponent.
"These two goals, the movement of Vardy between the central defenders, the cross with the left foot, it is a big frustration to accept. We should be two against one against Mahrez, not one against one. I feel that my work was betrayed.
"It's obvious we did not play at our best level. Players in crucial positions are not at their normal level. It is hard.
"Last year I did phenomenal work. They were at more than their level. We are doing so bad this season for some reason. Some of them are different.
"Day by day in training, I have no complaints. I am frustrated by the difference between training and matches. I have to be honest with them."
The decision came seven months after he won his third Premier League title with the club.
At the time, Chelsea were 20 points from the top of the table in 16th place.
Former manager Guus Hiddink took over as interim boss until the end of the season, before the summer appointment of Antonio Conte.
And now Mourinho is back in London, with Tottenham. It remains to be seen how the Chelsea fans will greet him when the two teams do battle on Sunday, December 22.
