City have a 13-point lead over second-placed Manchester United with six league games left but have been jolted by a run of three straight defeats in all competitions.
Second-place United dragged the title race out for at least another week by winning 3-2 at City last weekend, only to gift the trophy to City by losing to a team that is destined for relegation and had just one league win since August.
But Player of the Year nominee De Bruyne said they should forget about their disappointment and focus on their incredible season.
But City fans are no strangers to the Railway and they grew in number on Sunday evening as word got round that several players, plus members of the backroom staff, were mixing with locals and buying drinks for those in attendance, including Guinness and Jagerbombs.
While the players were caught out by United's surprise loss, one company were more than ready for it.
'I'd like to stay humble, it's not a dynasty, it's just one title.
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And it was achieved by playing a brand of football that has had the purists purring all season with City racking up 93 goals so far and on course to top the 100-point barrier. Not footballers who are really young, but players like Kyle Walker, Fernandinho and even Kevin de Bruyne.
'We needed a period of adaptation...his methods were the right ones, we believed in him. But expect one thing: statistics like scoring almost three goals per game, having almost 90 percent passing accuracy and averaging 72.7 percent possession are likely to continue. One thing Pep has been able to transfer to the team is that hunger and desire to never be satisfied'.
"Sooner or later it's going to happen", insisted Guardiola, who has consistently stated City's need to grow gradually on the European stage, having made the Champions League semi-finals just once in their history.
City's title is the 24th trophy of his glittering career.
City beat Tottenham Hotspur 3-1 on Saturday and have won 28 of their 33 matches. The Citizens have been widely praised, with many calling them the best team in Europe this season.