Chelsea are interested in Porto goalkeeper Diogo Costa.

Relevo are reporting that Chelsea have made initial contact over a deal for Costa, who has also been linked with Manchester United.

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.

Cristiano Ronaldo's representative seems confident he can pull off a deal by flogging Costa to the Premier League or elsewhere.