Taken from the telegraph.
£64 fee mentioned as the release clause.
"Haaland, 21, is expected to put pen to paper on a five-year contract worth around £107million, including signing-on bonuses. It is understood the overall cost of the deal could reach £213million once sums to agents, representatives and other assorted fees worth up to £42million are factored in."
Not a bad business to be involved in.