Chelsea are in contact with agents for Porto goalkeeper Diogo Costa.

Revelo says are reporting that Chelsea have made initial contact over a deal while Manchester United continue to circle in the background.

Problematically for both clubs though, Costa recently put pen to paper on a new long-term contract with Porto.

His new deal now contains a mega release clause worth an estimated £64million.

The report also states that super-agent Jorge Mendes has recently approached Porto to declare his interest in brokering a blockbuster transfer this summer.

Costa has kept 11 clean sheets in 23 outings in all competitions this season - including two at international level with Portugal in the Nations League.

Chelsea are expected to sign a new goalkeeper in one of the next transfer windows after Edouard Mendy lost his way at Stamford Bridge.