At 5ft 9in and around 76kg, many doubted whether Firmino could deal with the physicality of the English game, but the Brazilian has adapted to life in the Premier League extremely well, and is a key figure Liverpool's prolific three-man attack.
Firmino says that the key to his success in Englad is feeling good, and insists that he does not fear strong defenders.
"There is no fear at all," he told 'Sky Sports'. "Sometimes people see you as skinny and then they think 'he is not a strong player', but what matters is what you feel and what you do inside the pitch.
"No matter how skinny you are, the important thing is how you think psychologically. If you think you are strong, you are really strong, and I class myself as a strong player. I'm not intimidated by powerful defenders.
"Maybe when you are younger, playing against huge centre-backs might cause some fear to you, but when you are an older player there is no more fear. You simply play as best you can and go about your work".
Liverpool face Everton in the Merseyside derby on Monday night where they can reduce Chelsea's lead at the top of the Premier League to six points with a win.