Firmino missed Liverpool's last three Premier League matches due to a thigh injury.
City, who face Watford in the FA Cup final on Saturday chasing a historic domestic treble, retained their title by a point from Liverpool.
From reigning champions City to contenders Liverpool and struggling Manchester United, everyone will be eyeing improvement.
Have a look at some of the most hilarious trolls that hit the internet following Liverpool's epic victory over Barca in the UCL semifinal second-leg clash
Liverpool fell one point short of winning their first league title since 1990 despite the third-most points tally in Premier League history.
This term's winning tally of 22 was the lowest by players in English football's top-flight since 2010/11.
From Brexit to the tagline of a 1986 film, Premier League's managers had quite a lot to say.
Liverpool had won 2-0 and finished a league campaign with 97 points — a total, up until this season, that was more than any other team had managed apart from last year's record-breaking Man City.
Liverpool needed to better City's result on the final day of the season after starting the matches a point behind the defending champions.
A second consecutive title for City, who remain on course for a historic domestic treble, would underline their dominance.
City could make history by becoming the first side to ever win the English domestic treble but have had to grind it out in recent weeks.
The Reds are one point behind leaders Manchester City heading into their final game of the season against Wolves at Anfield.
The loss to City is Liverpool's only league defeat, and leaves Klopp requiring an unexpected result for the defending champion at Brighton.
Liverpool are in high spirits after a stunning 4-0 win over Barcelona on Tuesday booked their place in a second consecutive Champions League final.
UEFA rushed forward VAR's introduction into the competition and Video Assistant Referees have only added to the drama.