Pep Guardiola asked his friends back at Barcelona what to expect at Celtic Park, but nothing prepares you for nights like this. When the green half of Glasgow are in full cry, their team play like giants and the old place positively shakes.
By the time Guardiola and his players had emerged from a frantic, breathless ordeal in which they came from behind on no fewer than three occasions, the Spaniard had salvaged a Champions League point but seen his 100 per cent start at City come to an end.
An eleventh straight win in all competitions would have seen the Premier League leaders equal the English record set by Tottenham's Double winners in 1960.