According to Portuguese outlet Record, the Blues have approached Diomande's agents as they look to strengthen their defensive options. The 22-year-old Ivorian defender dreams of playing in England and would likely require guaranteed minutes at Stamford Bridge.
While Diomande has a £70 million release clause in his Sporting contract signed last month, the Portuguese club would be open to negotiating a lesser package. Arsenal, Newcastle United, and Crystal Palace have also shown interest in the defender, who has completed 94% of his passes in the Primeira Liga this season.