Van Dijk skipped training on Thursday after being invited to lunch with the Dutch Royals.
He recalled to AD: "After the invitation came in, I immediately asked the club if I could be there, because it was a bit difficult between the Champions League and the duel with Manchester City. Fortunately, Pepijn Lijnders (assistant manager) also did his best, of course, as a Dutchman who knew that this was something great.
"But it was certainly worth it. I sat next to the King until after the main course. We talked about anything and everything. Yes, of course also about football."