The west London club have been in the market for a new starting keeper due to concerns over both Kepa Arrizabalaga and Edouard Mendy, with the latter set to move to Saudi Arabia imminently.
There had been suggestions that new boss Mauricio Pochettino was happy to stick with Kepa and invest transfer funds into other areas of the squad instead.
But now Portuguese newspaper A Bola are reporting that Chelsea have concrete interest in Costa and are looking into ways of securing a deal.
Porto are adamant he will not be sold unless his €75million (£64.5m) release clause is paid up in full, with that price tag potentially making him the second-most expensive goalkeeper in history – behind Kepa.
Manchester United are big fans of Costa and have scouted him extensively, but Porto’s hardline stance has proved to be a rather significant obstacle.
Chelsea are willing to pay the £64.5m fee but are hoping to convince Porto to accept the figure in three instalments of €25m (£21.5m).
The first instalment would be paid now, with the next two coming in the subsequent two transfer windows.
Chelsea tried a similar approach with Benfica in January, when they agreed a fee bigger than Enzo Fernandez’s release clause and were permitted to pay it in six instalments – the first of which was around £30m.
The Blues are very mindful of their Financial Fair Play situation and cannot stump up a massive fee this summer for Costa, though it remains to be seen if Porto will be accommodating of their structured offer.
They rebuffed Paris Saint-Germain’s efforts to do a similar deal last summer with Vitinha and made the French side pay the whole fee up front.
Chelsea have also been linked with the likes of David Raya – though Brentford are demanding £40m despite the Spaniard only having a year left on his contract – as well as Inter’s Andre Onana.
The west Londoners are set to secure plenty of funds over the coming days and weeks, with as many as five players potentially heading to Saudi Arabia – including Mendy, Kalidou Koulibaly and Hakim Ziyech – while Mateo Kovacic is set to join Manchester City and Arsenal have agreed a £65m deal for Kai Havertz.
MORE : Manchester United unhappy with Chelsea over Mason Mount transfer saga
MORE : Christopher Nkunku reveals he is yet to have any contact with new Chelsea boss Mauricio Pochettino
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