The Scout is selecting five Fantasy Premier League players set to make an impact in Gameweek 31.
The Brazilian can have a big say in Gameweek 31.
Firmino is already part of 44.3% of squads. Only Mohamed Salah (£10.6m), who is owned by 61.3%, is more popular across the entire game.
Despite that, Firmino is the most-signed player ahead of Saturday’s 14:00 GMT deadline, claiming more than 125,000 new owners.
Firmino goes into Saturday's encounter having produced 13 goals and eight assists, placing him third among FPL forwards on 156 points.
His form has been unrelenting, and recent statistics suggest he will be a key figure against the Hornets.
Over the last four Gameweeks, Firmino's six shots on target are more than any team-mate.
He also ranks top for chances created over that spell, with 11.
Watford arrive on Merseyside having conceded 10 goals in their last five away trips.
Firmino's record against them will give him further confidence.
The Brazilian supplied a goal and an assist in the 3-3 draw at Vicarage Road in Gameweek 1. This was after he got a goal and two assists in a 6-1 victory at Anfield last season.
Backing the Liverpool attack looks essential for success in Gameweek 31.
Beyond Salah, it is Firmino who appears to be their most vital target.