COMMENT By Harvey Byrne

Ryan Bertrand is a doubt for Southampton heading into the south coast side’s match against Liverpool and ex-Saints star Sadio Mane could profit.

Bertrand, 27, is considered Claude Puel’s main left-back with youth graduates Matt Targett and Sam McQueen as back-up.

However, the former Chelsea player picked up an injury in midweek while with England and may now miss Saturday’s fixture at St Mary’s.

Targett is also out with an injury, which means 21-year-old Sam McQueen will be the most likely to come into the team for the England international.

The youngster has been converted into a left-back from a role on the wing and despite a strong first start at the San Siro against Inter Milan, there will still be questions that need to be answered when coming up against a quality competitor.

You don’t get much better at the moment than Mane, who is in red-hot form after completing a £34million move to the Reds from the south coast in the summer.

The attacker’s pace and trickery will cause issues to any team’s full-backs, never mind an inexperienced youngster.

Puel will have watched videos of Mane and will have had information filtered down to him from the scouting team, but he doesn’t have the same knowledge that predecessor Ronald Koeman would have had.

Mane, who has already scored six goals and provided four assists in 11 appearances since his move, could get a lot of joy from the right hand side of the pitch at the weekend.

In other Liverpool news, this Reds man has claimed that it is “unacceptable” for him to be on the Liverpool substitute’s bench.