Manchester City-s latest quest for Champions League glory got off to a winning start as Pep Guardiola-s men came from behind to beat Porto 3-1 at the Etihad on Wednesday. Luis Diaz-s solo effort punished a sloppy City start for the Portuguese champions, who felt hard done by when Sergio Aguero equalised thanks to a contentious penalty award. However, the Premier League side-s quality shone through after half-time when Ilkay Gundogan-s free-kick and substitute Ferran Torres- fine finish moved City to the top of Group C. Guardiola admitted on Tuesday to still feeling guilty over the experimental line-up and formation that led to City-s latest Champions League calamity in last season-s quarter-finals against Lyon little over two months ago.

The Catalan is into the final year of his contract at the Etihad and potentially his last chance to land the prize City most desired when they brought him to Manchester five years ago. However, in the early weeks of the season, City have look a faded force from the prime of Guardiola-s reign in winning back-to-back Premier League titles between 2017 and 2019. Without the injured Kevin De Bruyne, the English giants were again far from their free-flowing best and Porto took advantage early on.