The £29m summer buy has scored four goals in his last four games after a sluggish start to life in England and is tipped to be a key man for new-look Reds.
Former Barcelona star Ronaldinho says his fellow Brazilian Firmino is one of the best No 10s in the world and the £29million star has bagged four goals in his last four games for Liverpool.
Klopp is planning a summer overhaul of the squad he inherited from Brendan Rodgers in October, and Ronaldinho has told the Reds boss to sign players who will complement Firmino.
"I didn't ever question if he would be a great player for Liverpool, I knew that he would be," said the World Cup winner.
"He's one of the best at what he does in the world. He's in the same class as Ozil, Silva, Iniesta, and all the other great players who play that role
"He's the player that I'm sure Klopp will build his new Liverpool team around.
"Klopp is one of the best coaches in the world, he will know that Liverpool need better players, he will know that Firmino will need better players around him to get the most out of his game.
"I'm sure when he joined Liverpool, Klopp was promised he could bring in his own players, and with Firmino at the centre of the team, there's no reason Liverpool cannot challenge once again."