It's been reported by Kaveh Solhekol from Sky Sports that the FA Cup winners are considering signing Cech for a second time.
Cech left Stamford Bridge in the summer of 2015 following Courtois' return from his loan spell at Atletico Madrid.
Currently, the Belgian still has 24 months to go on his contract and the Blues have offered him KSh 39.9 million-a-week deal to extend his stay at Stamford Bridge.
"Thibaut Courtois is in Madrid, according to Twitter", he tweeted.
With Stephan Lichtsteiner joining Arsenal in June, the club are already well-stocked at right-back, and so a move for Sidibe would hint at a possible departure for Hector Bellerin.
The 26-year-old is into the final 12 months of his contract at Chelsea and has always been a reported target for Real Madrid, with his former partner and two children living in the Spanish capital.
The Telegraph say Chelsea doubt the asking price for Hazard will be met and therefore believe they will be able to keep the Belgian for at least one more season.
"He is a player who has maturity and a lot of leadership". Certainly after this World Cup. The Baggies will allow the striker to leave only if the Magpies meet his £16.5 million release clause.