Arsenal goalkeeper Wojciech Szczesny says Radja Nainggolan would make a big impact at Chelsea.
The Pole has been playing at Roma this season alongside the Chelsea transfer target.
Szczesny told FourFourTwo: "Is that official? I hope not! He's definitely a fantastic fit for English football – he's very strong, physical and tough.
"He's not afraid of anyone and he will fight for 90 minutes in every game.
"Combine that with very advanced technical skills and you have a complete player.
"If I was Chelsea manager, I'd buy him in a heartbeat. But I hope it's not the case and that he'll stay with us."