The season was defined by a series of stunning battles for race victories between the pair, as well as several collisions, including at the Italian, Saudi Arabian and British grands prix.
Verstappen health update provided after 2021 collision
Verstappen's crash on the opening lap of the British Grand Prix at Silverstone was a huge blow to the Dutchman's title ambitions, with Hamilton going on to claim his eighth Silverstone F1 victory, and close to within eight points of Verstappen.
The race started with Verstappen on pole but, after a great Hamilton getaway, the pair were jostling for position for the majority of the first lap.
As Hamilton went for an overtake on Verstappen heading into Copse corner, the pair came together, with their tyres touching at high speed, sending Verstappen flying off the track and into the barriers.
While Verstappen was helped out of his car and appeared to be okay despite the hefty impact with the barriers, Newey revealed the concerns of the Red Bull team amid the terrifying collision.
"I think Max’s one at Silverstone was the last one where we thought, ‘Is he okay? Is he badly hurt in there?,’" Newey revealed on the High Performance podcast.
"And then when he did come on the radio, because he was so badly winded, he was just grunting, and you don’t know what that means.
"He was very sore. He had a quite nasty concussion. He was very sore for a week after, but he was okay.
"So those sorts of accidents still can happen, and do happen. The one at Spa in the Formula 2 race with Anthoine [Hubert], was horrific, and it’s never going to be 100 per cent safe."