Van Dijk says Salah can use his World Cup heartbreak with Egypt as fuel for a potential quadruple at club level.
He said: "Well obviously, I feel sorry for Mo and for Egypt, but football is sometimes like this.
"I am sure he will turn the disappointment into success for the rest of the season. We still have everything to play for so there is a lot of things still to achieve for him.
"As for Sadio, I wish him all the best and if he is in our group, he is going to need that good luck!"