Three-man forward lines have been a staple tactic throughout the history of football.

But they have arguably never been as popular as they have over the last 15 or so years.

It is a resurgence that is largely down to Barcelona’s success under Pep Guardiola between 2008 and 2012.

Guardiola helped Barcelona win two Champions Leagues and three La Liga titles with a dominant possession-based style.

It was a revolutionary system that relied on both the midfield and front line – operating without a recognised number nine – to be fluid in and out of possession.

Eight‑time Ballon d’Or winner Lionel Messi was usually the most central attacker, though he often dropped deep to either drag defenders out of position and create space for his team-mates, or to create a numerical advantage in midfield.

Either way, the end result was a fluid style of football that was practically impossible to stop and resulted in Barcelona claiming 14 trophies during Guardiola’s time at the helm.

Since then, three-man forward lines have become fairly prominent in Europe, with the likes of Real Madrid and PSG deploying similar tactics in the years that followed.

In the Premier League, however, the forward line that resembled Guardiola’s side most closely was Liverpool’s Champions League and Premier League-winning trio of Sadio Mane, Roberto Firmino and Mohamed Salah.

During their five seasons together at Anfield, Firmino was deployed as the Reds’ central attacker and, similar to Messi, was responsible for dropping between the lines, linking play with the midfielders and ultimately creating space for Mane and Salah to run in behind.

The trio is widely regarded as one of the greatest forward lines in the history of English football, having helped Jurgen Klopp’s side win a haul of major trophies.