In one of the craziest 12 hours in Premier League history, the Special One was brought in out of nowhere to replace the outgoing Mauricio Pochettino.
The Argentine had overseen proceedings for five-and-a-half years at Spurs, guiding them to the Champions League final last season.
However, the hangover from that European journey has been deeply concerning, with Spurs currently 14th in the Premier League table.
They also haven't won away in the league in January, with players eventually growing tired of Pochettino's 'regime' in north London.
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But can Mourinho change the club's fortunes? After his dismal end at Manchester United in 2018, it's far from a formality.
And the Portuguese has reportedly already been dealt his first major blow in rebuilding Spurs' season.
The Guardian report that Mourinho will have no money to spend on players in January due to the club having to make huge repayments on their new stadium.
In his first interview as boss, Mourinho appeared to acknowledge the financial restraints that would be placed upon him as he constantly referred to Spurs' youth players.
“It’s a privilege when a manager goes to a club and feels that happiness in relation to the squad that he’s going to have,” Mourinho said.
“These are not words of the moment. They are not words of me being the Tottenham head coach. These are words that I’ve told and I’ve repeated in the last three, four, five years – even as an opponent.
“I really like this squad and looking to the young players – there is not one manager in the world that doesn’t like to play young players and to help young players to develop. There is not one.
“The problem is that sometimes you get into clubs where the work that is below you is not good enough to produce these players so I look to our history and you see that the academy is always giving the talents that the first team needs. And, of course, I also look forward to work with that profile.”
Mourinho is famously a manager that likes to build a team in his own image and that requires transfer funds.
His calamitous end at United was fuelled by Ed Woodward's reluctance to back him in the transfer market and surely Daniel Levy has promised Mourinho that he will support him come the summer.
If not, his demise in London could be swift...News Now - Sport News