Mane spoke about the game and the way Liverpool were able to overturn a 3-0 first leg deficit to progress to the final.
He said that while Klopp was motivating his players, Mane could feel that not even the German coach 100 per cent believed they could pull it off.
"Before the game [against Barca], I had never seen the boss like that," he recalled to Telefoot.
"Klopp encouraged us but, honestly, not even he believed it.
"He is exceptional, he makes you want to fight for him and give everything for him."