Klopp has utilised his 'gegenpressing style' to great effect at Anfield, and previously at Borussia Dortmund.
The Brazilian has personally benefited greatly from Klopp's management. He has now scored 20 goals across all competitions for the first-time since the 2013/14 season.
"The arrival of Jurgen Klopp was very important for my growth within the team," Firmino told Esporte.
"Since he arrived here at Liverpool, he has changed my positioning, put me playing as a forward and that was the watershed for me here at the club.
"Klopp is a fantastic guy. I rate him as an extremely professional coach, a perfectionist, with a winning mentality.
"I'm sure Klopp will be marked in the history of world football for his work and achievements."