The Lille star has announced he is signing with the Blues.
Mignolet, who now faces the prospect of having to keep his fellow countryman at bay in the Premier League, admits Hazard will have a considerable weight of expectation to deal with, but expects to see him shine.
"I think Eden has the qualities and talent to play in England," Mignolet said.
"On his day, he can make the difference for his team.
"It is a big step from Lille to Chelsea and he is going to be under some pressure, especially with the money that has been spent, but I think he is a good player and if he is on his day, he can do a good job for Chelsea."