An F1 insider has opened up about an alleged heated argument between Christian Horner and Max Verstappen's father.

Red Bull’s Formula 1 team is changing team directors for the first time since it was founded 20 years ago, after Christian Horner's sacking sent shockwaves through the sport on Wednesday.

Horner is a key figure in one of the most dramatic and controversial title fights in history as Verstappen beats Lewis Hamilton to the championship.