The Dutchman is very likely to be playing in a red shirt at some point in the near future, but this was an unhappy Anfield experience as the visitors lost 3-0.
Here, Press Association Sport takes a closer look at Van Dijk’s performance.
There is no doubt Van Dijk is a classy player.
Playing almost as a sweeper, the 26-year-old was good at spotting the danger in front of him and intercepting, although the visitors did get increasingly over-run as the match wore on.
He got Saints out of trouble at the start of the second half with an inch-perfect tackle and was his usual commanding presence in the air.
That strength in particular would be a big asset to Liverpool.
Another of Van Dijk’s qualities is his comfort on the ball, and he was more than happy to bring the ball forward out of defence, taking three or four touches where other defenders would have only taken one or two.
His attempts at long-range passing were not so successful, with one clipped ball to Nathan Redmond sailing harmlessly out of play in the first half.
If Van Dijk was clearly Southampton‘s best defender, that counted for little in the final result.
The Saints defence as a whole struggled to cope with the threat of goalscorers Salah and Philippe Coutinho, with most of the danger coming from wide positions.
The second goal was the major black mark against Van Dijk personally, with the Dutchman leaving centre-back partner Wesley Hoedt exposed.