Guardiola inked a two-year extension to stay at City on Thursday to put an end to speculation regarding his future.
The Spaniard's new deal will also take his stint at the Etihad to over a decade once it expires in 2027.
City's fixture against Tottenham on Saturday provided the perfect opportunity for Guardiola to cap off the week in style.
However, Ange Postecoglou and his Tottenham side evidently did not read the script.
James Maddison struck twice in the space of seven minutes in the first half before Pedro Porro smashed home a third early in the second half to set Tottenham well on their way to victory.
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Brennan Johnson provided the icing on the cake in the 93rd minute when he slid home Timo Werner's cross to complete the four-goal rout.
The result left the City faithful in a stunned silence as they could not believe what was transpiring before their eyes.
As for the travelling Tottenham fans, they couldn't help but poke fun as Guardiola became the target of their mocking.
In fact, Tottenham supporters were heard chanting to Guardiola: "You're getting sacked in the morning".
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Given Guardiola just signed his new contract, it's a safe bet to say the City board won't heed Tottenham supporters' call.
However, the 4-0 defeat to Tottenham marked the first time Guardiola had lost three Premier League games on the bounce.
It was also City's fifth-straight defeat, the most consecutive defeats Guardiola has ever overseen during his managerial career.
If the record-breaking runs of losses weren't enough, Tottenham's 4-0 thrashing was the heaviest defeat Guardiola has suffered at home during his City stint.
As for Postecoglou, it was the second time in the space of a month he had out-witted Guardiola after Tottenham knocked City out of the Carabao Cup with a 2-1 victory on October 30.
Luckily for City, the defeat to Tottenham didn't dislodge them from second place, as they remain on 23 points.
But if Liverpool beat Southampton on Sunday, Guardiola's side could end up being eight points behind the Reds.
Guardiola and his City squad have proven multiple times they can overcome serious points deficits in the past.
But with their star midfielder Rodri gone for the majority of the season and other key players coming in and out of the casualty ward, Guardiola will have his work cut out if he is to lead City to an unprecedented fifth-straight Premier League crown.