Multiple sources are reporting that Diogo Costa is the subject of an offer from Chelsea, who have made a move to sign one of their top transfer targets. The goalkeeper, currently at Porto, is now at the centre of negotiations between the two clubs - while it remains to be seen whether the opening offer will be enough for the team to part with their man. PSG, Aston Villa and Galatasaray may look to intervene if talks continue without resolution. Alongside this, Porto are said to be exploring Roony Bardghji and Eliezer Mayenda Dossou with Chelsea likewise connected to Andreas Schjelderup, Danilo Dos Santos De Oliveira and Geovany Tcherno Quenda. Want to see how the story develops? Stay tuned to PlayerSwitch for more news and transfer rumours just like this one.