How Doku became key player for treble-chasing Man City

He said: "Everybody knows that he's made an incredible step in the sense of saying, 'I am Jeremy Doku, I am going to win games.' The greatest players always have that mentality.

"It [all] depends on mentality. [He has to say] I want to become one of the best in the world, otherwise you're in a comfort zone. That is how you reach that [next] level."

And for as much as Doku has improved on the pitch, he has shown that level of self-reflection, accountability and focus off it too.

Doku has spent time working with Gabriel Deieno, a mental performance coach who works with elite athletes.

And after a particularly impressive performance against Liverpool, Doku credited his deepening faith in God for his success.

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The smallest of distractions at the highest level can derail the most talented of players but Doku has has found stability off the pitch

Across this season, Guardiola has trusted Doku in a number of roles. Irrespective of what he has asked from him, what has remained constant has been how much responsibility the City boss has given his winger.

With the increase in man-to-man defending in the Premier League this season, the strength and dribbling quality of Doku has allowed him to get the better of the opposing defenders even if teams double or triple up on him.

This changing tactical landscape has therefore made him increasingly key to City.

In City's 3-0 win against Manchester United, Doku was asked to leave the touchline, moving into the centre of the pitch. This helped City overload United's midfield two with four of their own players.

With City's midfielders close to each other, Doku - receiving in-field - would turn and drive at the defence, attracting players towards him while freeing up space for Nico O'Reilly on the left flank.

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Against United, Doku moved into midfield helping City create central overloads - and left space for Nico O'Reilly on the flank

And much of City's success this season can be put down to the on-field relationship of that left-sided duo.

For most of the campaign Doku has taken a more natural left-wing position, which has put opponents in a lose-lose situation.

By doubling up on Doku, teams have attempted to minimise his dribbling threat, in turn leaving space for O'Reilly to get into the box. This has led to the England full-back amassing 15 goal contributions in all competitions this season so far.

When teams have instead focused on O'Reilly's central attacking position, Doku has then relished the chance to dribble past a single defender before dangerously cutting the ball back to his team-mates.

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Here we see Doku's positioning dragging Arsenal's right-back Ben White out wide, leaving space for O'Reilly to run into

When Doku joined City, part of the rationale was to utilise him on the right wing - a position he played at Rennes more often than he has in Manchester.

From here, instructions were simpler. He could beat his man on the outside with his speed and play crosses with his stronger right foot.

Perhaps a sign of trust in his total footballing ability, Doku's role on the left wing has evolved further this season into one that allows him to cut inside and play centrally - often on his own accord.

By rolling his defender and facing the opposition's goal when the game becomes stretched, he has added to his arsenal of assists by playing through balls to Erling Haaland running in behind.

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For the opening goal against Galatasaray, Doku finds Haaland running in behind. From central positions, Doku can play vertical passes that suit the Norway striker's strengths

Against more stubborn defences, Doku has shown an ability to cut inside and away from goal, increasing the distance from nearby defenders, before striking the ball into the far corner.

"When I look at all my goals this season, I don't see one tap-in," Doku says. And although this appears to be a good problem to have, the winger's thirst for self-improvement was clear.

"When I look at, for example, Sterling in his seasons here, all the tap-ins that he scored - at least five, six, seven a season.

"I want to score also those goals where I just tap-in, [back] post, run in and tap-in. That's really the thing that I need to work on."

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Doku's signature finish appears to be this cut-back movement that gives him enough space to take a shot into the far corner

The strengths that set Doku apart came fairly naturally. But hard work has improved his understanding of the game to best maximise that talent.

While he looks to add tap-ins to his attacking game next, he deserves credit for already having improved his defensive understanding this season.

Guardiola's City have opted to defend in a 4-2-4 formation out of possession, holding their shape before pressing in specific moments.

The two strikers are tasked with blocking passes into midfield - so it falls to the wingers in this system to take on the physically taxing job of pressing the opposition's centre-back while also blocking passes into the full-back.

Doku, alongside Antoine Semenyo, has done this well and was key in nullifying Arsenal's build-up in both the Carabao Cup and Premier League wins in recent weeks.

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City's 4-2-4 defensive shape requires intensity and an understanding of when to press from the wingers

Doku's tenacious pressing has also resulted in him winning the ball back high up the pitch then scoring after turnovers in games against Chelsea and Brentford.

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Doku and two team-mates converge around Chelsea's Moises Caicedo. Doku wins the ball from this situation, drives at goal and scores City's third goal

Whether City win the FA Cup or the league is yet to be seen, but to get this close in three competitions is in large part a testament to Doku's ability to carry the team in attack as Guardiola looked to find his best starting XI.

Despite having a personally impressive season, Doku is reluctant to rest on his laurels and Guardiola's comments read like a challenge aimed to keep the winger on that path.

"I think all season he's been really, really good, and the limit depends on him," said Guardiola.

"Players who want to be better will be better. Players who live all their life trying to be better and prepare the body and mindset to be better, will be better.

"It all depends on him."