It's agreed: Man City are not bad. But how has Pep Guardiola managed to oversee this turnaround in fortunes? Last season they didn't win anything, this season they might win it all.

What has changed?

The goalkeeper fiasco

Ederson de Moraes was clearly a well-researched purchase. At 24 years old, he has potential to develop and form a long-lasting rearguard with John Stones and whoever happens to partner him, but crucially he is already one of the best ball-playing goalkeepers in European football. This makes him an instant improvement to the City defence.

He offers more than shot-stopping though. Man City dominate possession by stretching the pitch and playing a high defensive line to force the opposition back deep in their own half, something opposition teams counter with balls over the top. In this system, Guardiola's goalkeeper has to play as a sweeper, racing off his line proactively to deal with passes aimed near the penalty area.

Napoli did exactly this during their two Champions League games, with Ederson equal to most sent his way.