The England international says he learned plenty from facing the Senegal star.
He told the Athletic: "Over the past five to 10 years, the full-back position has progressed a lot.
"My toughest opponent has been Sadio Mane. He is one of the best wingers in the league, if not the world.
"It used to be about defending but now it is about not only being very good at defending but offering a big attacking threat."