Robertson picked up a yellow card very late on in Germany, which sees him suspended for Liverpool's opening quarter final clash.
After Wednesday's match Van Dijk played down the bad news, telling BT Sport: "Yes. It happens in the game but obviously it was a bit unlucky.
"We need to cover it up and we will we have plenty of quality in the squad to do so."
However moments earlier he was seen shouting at his team-mate.
On first look it appears that the Dutchman is angry with Robertson, especially as he utters the words: "What are you doing?"
But it instead appears that Van Dijk is asking the left-back why he isn't celebrating the win, suggesting he should be happy Liverpool are through despite his suspension.
Van Dijk to Robertson “What you doing?!” pic.twitter.com/fDuOWDjWe3— (@GerrardStand8) March 13, 2019