Blues almost signed the midfielder in the winter window and are ready to try again as they strengthen title-bound squad that fell short in Europe

Jose Mourinho will relaunch his attempts to sign Brazilian midfielder Douglas Costa with a £20million bid.

Chelsea boss Mourinho was keen in January and is ready to revive his interest in the summer – as long as there are assurances over the Shakhtar Donetsk star Costa’s fitness.

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Real Madrid and Barcelona are also interested, while Manchester United, Arsenal and Liverpool have all made enquiries, but Chelsea are in pole position after having lengthy discussions about a move in the last window.

Mourinho is a big admirer of the 24-year-old but while Chelsea signed Juan Cuadrado from Fiorentina in the winter window, they could not get the Costa deal done in time.

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Their interest is still there and they are back in the hunt for Costa, who is keen on a move to the Premier League with a Champions League club.

The league-leading Blues are keen to shake up the squad after this season’s faailure at the last-16 stage of the Champions League, with Real Madrid’s Raphael Varane their No1 defensive target.

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Costa is also very much in their sights and these regular fitness checks show they are keen to finally get the transfer done this summer.

Gaining a work permit will not be an issue as Costa has dual Brazilian/Portuguese nationality.