Kleberson has lifted the lid on sharing a Manchester United dressing room with Roy Keane.
The Brazilian admits Keane could "explode" at times.
He told Goal: “He could definitely explode sometimes but it was always for the good of his team-mates and his team.
“Sometimes he screamed at me but at that time I didn't know much English, so I would just tell myself he was saying something good and kept going!
“Everybody knows his personality but when I was there, I didn't have any difficult moments with him. He pushed me a lot. He would try and get me more engaged in the game and he taught me a lot about closing down opponents.
"Everyone thinks they know Keane and his personality but those close to him know he's a nice guy and he really tried to help me."