Chelsea already knew the odds were slim. No team that has been clear by at least 10 points at the top of the Premier League after 21 matches has ever failed to lift the trophy.

The Blues travelled to leaders Manchester City on Saturday exactly 10 adrift and desperate to improve on their showing against Pep Guardiola's men from earlier in the season.

But a familiar foe once again brought their downfall as City sealed a 1-0 win that further increases their lead at the summit and probably has them over the horizon in the title race – at least as far as Chelsea are concerned.

Thomas Tuchel spoke with great clarity and assuredness as he addressed the media on Friday, accepting Chelsea were far too negative in their 1-0 defeat to City at Stamford Bridge earlier in the season.

We say "defeat", but in reality it was as close to a 1-0 battering as they come. City tallied three times as many shots as Chelsea (15 to five), and it was a similar story in terms of touches in the opposition's box (34 to 11).

But there was little sign of a major improvement here. Tuchel flailed and flapped like a headless chicken on the touchline, his instructions ultimately powerless against a City side that smothered Chelsea with a high press that just seemed to suffocate them more as the game went on.

Initially, as much as anything, Chelsea just looked confused. Their bravery in playing out from the back was to be commended in some instances, but that mentality seemed to be completely at odds with almost everything else they did.

They would get into the midfield but then launch long balls out wide or to Christian Pulisic in the hole rather than for Romelu Lukaku to run onto. The moves would go nowhere.

There was no period of sustained pressure from Chelsea at all in the first half – in fact, they got to the interval without registering a single shot, the first time that's happened in a league game under Tuchel.

Lukaku, bar one early instance where he rolled John Stones before mucking up the final pass, cut a frustrated figure up top. While Chelsea's play in the build-up largely seemed unlikely to get the best out of him, his team-mates might have expected more attempts to run in behind the City defence.

The second half was just a few minutes old when such a situation did present itself, with Lukaku able to do what he's best at: running on to throughballs rather than acting as a target man.

Ederson produced a fine save to block Lukaku's effort, but it was the clearest evidence yet of how Chelsea were likely to hurt City – not that it was necessarily a sign of things to come for the visitors.

If anything, it served as a jolt for City, a reminder that, as good as they are, they weren't going to be able to sleepwalk to a win here.

City allowed Chelsea more of the ball, but Guardiola's men upped the intensity significantly with their pressing – the Blues started to find passing through the midfield rather trickier.

Eight of the nine times City won possession in the final third (Chelsea only did so once in the whole game) came in the second half, which was not only evidence of how they were able to impressively dig deep physically, but also highlighted how a team can take the game to an opponent even without the ball.

Of course, City relied on a moment of pure inspiration, which was somewhat predictably delivered by Kevin De Bruyne, who strode away from N'Golo Kante and saw his gorgeous curling effort find the bottom-right corner from 25 yards.

It was his fifth Premier League goal against Chelsea, making his old club his favourite opposition in that regard, and a figure bettered by no other former Blue in the competition.

In the context of the match, it also highlighted the differing fortunes of players with comparable pasts: both De Bruyne and Lukaku joined Chelsea as youngsters and ultimately failed to make an impression.

The midfielder now regularly lights up the Premier League, but his international colleague is back at Stamford Bridge and struggling again, albeit for different reasons.

But the fact of the matter is, Lukaku was brought back to turn Chelsea into title contenders – that now looks impossible thanks to another familiar face.