Firmino is integral to the way Liverpool play and his selfless runs and pressing help bring the best out of Sadio Mane and Mohamed Salah.
Despite Divock Origi’s impressive display against Watford, Firmino’s unique qualities make him indispensable in this Liverpool side.
Reds supporters will also be hoping the forward can return to the side for another reason seeing as he is yet to lose against Everton in seven appearances.
The star has never managed a goal against the Toffees and he will be keen to put that barren run to bed this weekend.
Roberto Firmino came off for Divock Origi when he struck the dramatic winner in December (Image: GETTY)
Roberto Firmino rolled his ankle in Liverpool's 0-0 draw at Manchester United (Image: GETTY)
Firmino has won five and drawn twice against Everton who have struggled against their Merseyside counterparts in all competitions in recent years.
He is not the most popular among rival fans either after a clash with Mason Holgate saw him accused of racially abusing the defender.
Firmino was later cleared by the Football Association after an investigation into the incident.
Klopp offered supporters hope earlier this week that he could be fully fit for the derby.
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Roberto Firmino clashed with Mason Holgate in the FA Cup game in January 2018 (Image: GETTY)
"It looks good, we were obviously lucky," Klopp said.
"It is not as serious as we thought in the first moment. If Bobby goes down and leaves the pitch it is always a bad sign because he's a pretty hard boy.
"We play tomorrow and it will be very close for that, but there’s a big chance for the derby.
"Because it’s Bobby, I would say yes there is a chance even for Watford, but I don’t know if I would use that chance because we played Sunday and then Wednesday immediately.
“But writing Bobby off is a big mistake because he recovers pretty quick."