According to A Bola, if Ederson departs City next summer, Costa is seen as the leading candidate to step in as the replacement for the Brazilian goalkeeper.
Porto goalkeeper Diogo Costa is firming as a major target for Manchester City.AdvertisementAdvertisementEderson is a target for several Saudi Pro League clubs, where a package worth £1m-a-week has been touted for the shot-stopper.
Porto are seeking around €75m to sell Costa - a valuation which City deem as too steep.
Instead, City will seek to do business for around €50m.