Kewell won the Champions League with the Reds.
"We always talk about Liverpool and think 'do they need that 30 goal a season striker?'
“But for me, Firmino has been excellent, I can't fault him.
“He works so hard in positions on and off the ball which is fantastic.
"Then you have Mane and Salah driving at you at any given moment and both of them seem to have a little competition with each other to see who can score the most goals.
“It's just excellent."