The Barcelona midfielder has signed for Bayern initially on-loan.
Ze Roberto told Kicker: "In my opinion, Coutinho is a first-class player. But he has to prove it by getting back to the level he showed in Liverpool. But I think Bayern is a club with a perfect atmosphere for him to do that.
"His greatest strength is his ability to shake the lines of the opponents. With his dribbles, but also with his game intelligence, which means he knows how to use the other players in front of goals, he knows how to free them. But he has to score more goals."