The Sky Blues have used the Estadio do Dragao as their hunting ground to land both Fernando and Eliaquim Mangala in recent times, with the club’s domestic success helping to develop their talents.
And reports claim that City have had scouts in Porto to watch Corona in action against Benfica.
It’s believed that the 22-year-old impressed the travelling Etihad Stadium contingent, which could lead to a winter move.
Porto inserted a £36m release clause into the Mexico international’s contract when they signed him from FC Twente last month.
Such a sum may be a stretch even for City, who spent in excess of £100m to sign Raheem Sterling and Kevin De Bruyne during the last window.