Chelsea look set to admit another transfer mistake in the summer, as they look to address one key area of their squad.
Though the Blues didn't spend anything in the most-recent January transfer window, their £1bn spending over the three windows before that has been heavily criticised - especially with a lack of progress on the pitch.
Some positions also look like they're lacking the true quality Chelsea need to compete at the top of the Premier League once more, too, with the striker and goalkeeping areas a problem.
Chelsea only signed Sanchez last summer from Brighton, bringing the Spaniard to Stamford Bridge for £25m. He's not been entirely convincing, however, conceding 25 goals in 16 games in the Premier League prior to his injury.
And now it seems Mauricio Pochettino could get the goalkeeper he desperately wants in Diogo Costa, who has earned plenty of plaudits in Portugal for his shot-stopping ability and comfortability on the ball. He's let in just 13 goals in 20 games this term, and at 24-years-old he certainly fits into the Blues' transfer policy.
Costa won't come cheap, though. The highly-rated 'keeper is valued at £40m by Transfermarkt, but Porto reportedly want at least £70m for him. With his current deal running until June 2027, the Portuguese giants can feasibly afford to hold out for a figure as pricey as that, too.
Sanchez isn't the only goalkeeper that Chelsea could sell this summer to raise vital funds, though. Kepa Arrizabalaga is currently on loan at Real Madrid and looks nailed on to leave this summer.
While he won't fetch the extortionate £72m fee he did in 2018, a sale would help free up some wages and bring in a little bit of money to help with the balance sheet.
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Mauricio Pochettino says he has grown tired of having to 'explain' Chelsea's poor season.
Meanwhile, Declan Rice allegedly wanted to join Chelsea before his big move to Arsenal last year.
And the Blues are reportedly set out to miss on a wonderkid who wants to join a 'big club'.
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