City were also keen on the departing Southampton defender before this week's events.
Guardiola insists there is nothing untoward in that fee.
He said: "Liverpool took an amazing player, Van Dijk is an exceptional central defender. That's a price we'll see (again) in the future. If he plays six or seven years at a high level it would be cheap.
"John Stones, when he came here, people said he was too expensive. Now he's too cheap. It always depends on the value of what happens on the pitch."