The Reds defender returned to the West Derby base to begin pre-season training on the day he turned 27, alongside compatriot Georginio Wijnaldum.
As the second stage of their schedule concluded, the rest of the squad headed out for a recovery session after beating Chester FC 7-0 in a friendly on Saturday.
But not before gathering to sing 'Happy Birthday' to both Van Dijk and goalkeeping coach Achterberg. Watch the moment in the video above.