The Belgian winger endured a tough first campaign in the Spanish capital which was largely due to injuries.
While Hazard has not featured this season due to a muscle problem, Courtois believes his countryman will 'explode' soon.
"Hazard? I have no doubt, I am sure we will see the best Eden Hazard," the goalkeeper told Cadena SER on Wednesday.
"He is the first with the desire to show it. I see him very well and hopefully soon he can prove it.
"Just before his injury, he played several games very well and there he had such bad luck and getting out of that was not easy. But now this month I saw him train very well. I am sure that in no time he will explode and will to give many joys to the team."