Max Verstappen said the confusion at the end of the Japanese Grand Prix that saw him declared Formula One world champion was "quite funny", but an impending cost-cap ruling could wipe the smiles off faces in the Red Bull garage. The 25-year-old Dutchman became the second youngest double world champion on Sunday, after Sebastian Vettel, when Ferrari's Charles Leclerc was given a time penalty relegating him to third place at Suzuka. The news emerged as Verstappen was giving his post-race TV interview, but even then there was uncertainty as to whether reduced championship points would be awarded because the winner had completed only 29 of 53 laps because of bad weather.