But notably, it came the day after the London club controversially set out its intent to join others in a breakaway European super league, with chairman Daniel Levy unhappy at how Spurs have become Premiership also-rans under Mourinho.
Tottenham's swashbuckling credo is "to dare is to do". But fans hungry for success swallowed their initial misgivings over the appointment of a coach who was ruthlessly pragmatic in his style of play.
While he claimed three trophies at Old Trafford, including the 2017 Europa League, the end came with a dismal run of results and high-profile disagreements with players.
Robson appointed the young sports science graduate as his interpreter, and Mourinho followed the former England manager to successive positions at Porto and Barcelona, becoming assistant coach.
The Portuguese club went on to beat Monaco in the final, and Mourinho was now in the sights of Chelsea's ambitious new owner, Russian oligarch Roman Abramovich.
He put Abramovich's billions to spectacular use to end the Arsenal-Manchester United duopoly, winning the Premier League title in his first season and repeating the feat the following year before things turned sour.
In June 2013, Chelsea appointed Mourinho -- now the "Happy One" -- as manager for the second time.
And with his stormy time in North London also now cut brutally short, Mourinho is in unknown territory, a managerial failure for the first time since leaving Portugal.