Blues boss Maurizio Sarri lauded Alonso as the best left-back in Europe after the Bournemouth win and Hazard has a similarly high opinion of the Spaniard.
The Belgian said: "He's sometimes in front of me.
"I want to say to him 'Marcos, sometimes your first target is to defend, because you play left-back'.
"This guy doesn't want to listen, he just wants to score goals. No problem. He's doing well. We're lucky to have him in the team. Fantastic."