Back in business! Liverpool players report for their first day of pre-season training as boss Jurgen Klopp puts his returning stars through gruelling fitness tests... and Luis Diaz reveals his new blonde look

A host of Liverpool players returned for pre-season training on Monday as Jurgen Klopp's side begin to step up preparations for the new Premier League season.

Liverpool captain Jordan Henderson was accompanied by some of the club's star players including Luis Diaz, Fabio Carvalho, Harvey Elliot and Alex Oxlade-Chamberlain.

Those players who represented their respective countries in post-season matches, including Mo Salah who recently signed a new long-term contract with the club, will return from extended breaks on July 9.

Jordan Henderson was one of a number of Liverpool stars to complete intense treadmill tests

Smiles all round from the Englishman who lifted the FA Cup and Carabao Cup last season

Henderson is put through his paces as medical professionals analyse his cardio results

It was smiles all round for players returning for club duties after previously parting ways for the summer following Liverpool's agonising Champions League final defeat against Real Madrid.