Borini is currently at Sunderland on a season-long loan deal from Liverpool, and Mignolet has backed the Italian to impress during his time at the Black Cats.
The 25-year-old told Sky Sports News: "I know that Fabio can do really good things over there, it's a place where he will enjoy playing football. Once he starts scoring goals, the fans will love him as well.
"I think that it's a very good place for him to be and he will definitely do well for the club. I'm hoping the club does well."
The 22-year-old is ineligible to compete against his parent club on Sunday when they meet on Wearside.