Thomas Tuchel tuning up Leroy Sané to make a big noise on return to the Etihad

Thirty-six minutes into his debut as Bayern Munich’s head coach, Thomas Tuchel was sitting open-mouthed, eyes fixed forward, making a no-look note on a pad in his left hand. Leroy Sané had just misjudged a pass. Tuchel jotted down his aide-mémoire, something to talk about later.

In the away sections at the Allianz Arena on Saturday, spectators at Bayern versus Borussia Dortmund, second in the Bundesliga hosting first, had been watching open-mouthed since the 13th minute, the cue for a cascade of Bayern goals that would reverse the hierarchy at the top of the table and give Tuchel the perfect start to his new job. Gregor Kobel, the luckless Dortmund goalkeeper, delivered the first gift with a moment of panic that recalled an observation made