Liverpool legend Jamie Carragher has taken a swipe at Celtic boss Brendan Rodgers.
The Brazilian arrived last summer after Rodgers signed him from Hoffenheim.
Firmino had flashes of brilliance last term but this year he has looked the real deal for Liverpool and Jurgen Klopp.
Carragher told the Liverpool Echo: "In Firmino's case, Brendan probably didn't have enough time to work with him.
"I think he's vital to Klopp, I think he'll be one of the most important players in the team.
"The way he likes to play, and what Klopp wants from his players [is the same].
"I think it's brilliant that [Klopp]'s come in and got so much out of these players."