What Roberto Firmino has done after Luis Diaz signing asks Liverpool future question

Almost from day one of Jurgen Klopp's Liverpool reign, Roberto Firmino was being asked to reinvent himself.

Arriving from Hoffenheim in the summer of 2015, the Brazil international joined to be an attacking midfielder under Brendan Rodgers but found himself being thrust further forward once Klopp had got his feet under the table at Anfield in October.

The term 'false nine' was subsequently bandied about as supporters became adjusted to a new type of centre-forward at the club; one whose overall output outweighed a fairly modest goal return by some of the legendary strikers' standards of years gone by.

Just about making it to double figures in the Premier League in his first season, his 10-goal return was fairly ordinary for a Liverpool striker when viewed solely in that particular prism, but Firmino's importance to the cause was growing as Klopp's revolution gathered pace.

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As Firmino continued to evolve as a No.9 at Anfield, he would become the foil for Sadio Mane and Mohamed Salah as the trio - who would collectively become affectionately known as 'the front three' - blasted in 91 goals between them in the 2017/18 campaign.

But after changing himself from a creative midfielder to someone who added a fresh twist on the classic No.9 role, Firmino is once again