Media reports claim that Chelsea are keeping tabs on Ousmane Diomande, who currently plays as a defender for Sporting. The move is still in the early stages, but interest appears to be growing. Liverpool and Crystal Palace remain in the background, but for now, Chelsea are leading the way in ongoing talks. Defensively, Chelsea are sitting around the league average this season, at 1.29 goals conceded per game. Someone like Ousmane Diomande could keep them steady but also raise the level when it matters most. Reports suggest Chelsea are monitoring Murillo Santiago Costa dos Santos, Mike Penders and Yehor Yarmoliuk whereas Sporting have not been associated with other players at this stage. Looking for Chelsea transfer rumours? Follow us on Twitter @PlayerSwitchCom for more rumours just like this.