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The Spanish giants have already made an enquiry for the keeper as they line up a successor to Victor Valdes.

Cech has held talks with boss Jose Mourinho and is understood to be tempted to leave for a new challenge after nine years at Stamford Bridge.

Mourinho’s return to Chelsea helped persuade Cech to stay put for the time being. The 31-year-old was desperate to work with Mourinho again and the pair have already held talks in which the Blues boss indicated he is under pressure to bring through Chelsea’s next generation of stars.

Mourinho still rates Cech as one of the world’s best goalkeepers.

But he is also a huge fan of Chelsea keeper-in-waiting Thibaut Courtois, 21, who is in his third season of a highly-successful loan spell at Atletico Madrid.

Mourinho accepts the time is fast approaching when he will have to make a decision on bringing Courtois into the first team fray.

Courtois is a wanted man with Chelsea having received a string of offers for the highly-rated Belgian.

And he is also suspects Courtois will have no intention of settling for a place on the substitutes bench after proving himself in Spain.

Reports in Spain suggested Chelsea and Barcelona could strike a swap deal involving Cech and Valdes in January.

But Mourinho has no plans to let Cech go mid-campaign while the player himself is adamant he wants to see the season out.

Long-serving Barca keeper Valdes is set to quit the Nou Camp at the end of the season.

The Catalans have also enquired about signing Pepe Reina from Liverpool when his season-long loan at Napoli ends.

Sources close to Reina even insist he has already signed a pre-contract with Barcelona - but the news of Cech’s potential availability has left the Spanish giants reviewing their options.

Meanwhile, new signing Willian has vowed to break into Brazil’s World Cup squad by tearing up the Premier League with Chelsea.

He said: “There is no doubt English football is very big, with huge visibility. I hope that helps me to be called up for the national team - but of course that depends on me.

“I will have to play and prove I deserve that spot. I first have to become a regular starter, then play well and be called up [by Brazil], this is my goal.”

Chelsea snatched Willian from Shakhtar Donetsk in a £32m transfer when he was about to sign for Tottenham.

But the 25-year-old said: “Things just happened. Chelsea came with an offer and everyone knows that I wanted to play for the club since I was at Shakhtar.

“It shook me, but I didn’t think twice. As both presidents are friends, that helped too. It was a very easy negotiation.

“The Brazilians (at Chelsea) called me, especially David Luiz, who told me to come quickly. I wanted to play at Chelsea, even more so now with Jose Mourinho, who is the best at what he does.

“When I had a day off, I came to watch the club’s games, so I am more than happy for having made this transfer become true.”