A legendary engineer in the world of F1, Newey has won 13 drivers’ championships and 12 constructors’ titles with the likes of Williams, McLaren and Red Bull in what has been an incredible career.
Brundle also believes that his decision to leave Red Bull is not entirely down to the drama surrounding the team.
"I don't think it's all about what is happening at Red Bull earlier on in the season, I think there are a number of factors. This has been in his mind for a long time,” he added.
"He does 150 days a year at Red Bull. Adrian has had his mind on other things - hypercars, Americas Cup boats, he's got some beautiful race cars of his own that he loves to race.
"Adrian has been moving towards this for some time."