Chelsea are long-term admirers of Real Madrid midfielder Casemiro, 90min understands, and the Blues would be interested in signing the Brazilian this summer.
The 30-year-old has been a core part of Real's successful midfield since returning from his loan with Porto in 2015, and his status as one of the game's best defensive midfielders has recently piqued the interest of Manchester United.
A natural defensive midfielder has been part of Chelsea's transfer wish list for years and scouts have done plenty of work on Casemiro, who only signed a new contract with Real last August.
Los Blancos are reluctant to sell Casemiro - manager Carlo Ancelotti is desperate to keep his famous midfield trio together - but it is understood that Real could be tempted to do business if an offer of over €60m (£51m) arrived.
Such a fee would make Casemiro the second-most expensive over-30 player ever, behind only Cristiano Ronaldo's €112m move to Juventus in 2018.
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Real have long been preparing for a future without Casemiro and fellow ageing midfield stars Luka Modric and Toni Kroos. Eduardo Camavinga was signed for €40m in 2021 and fellow Frenchman Aurelien Tchouameni joined this year for a further €100m.
Federico Valverde is also emerging as a superstar but has recently carved out a niche for himself on the right side of Ancelotti's attack.