The defender was so sure Salah would score his one-on-one against Porto he started celebrating before the forward had even taken his shot.
The Reds cruised through to the semi-finals of the Champions League with a 6-1 aggregate win over the Portuguese side.
Sadio Mane put Liverpool 1-0 up after 25 minutes before second half goals from Salah, Roberto Firmino and Van Dijk sealed a 4-1 victory at the Estadio do Dragao.
The Egypt international ended any hope of a Porto comeback by putting Jurgen Klopp’s side four goals up in the tie.
He was played through on goal by Trent Alexander-Arnold and Salah made no mistakes with just the goalkeeper to beat.
Van Dijk can be seen raising his arms on the halfway line before Salah has even taken his shot.
It was his 23rd goal in all competitions this season for the Reds and he also has netted 67 times in 98 appearances.