Horner has been team principal of the outfit since 2005, when they purchased the Jaguar team – turning it into an F1 dynasty across two separate periods of dominance.
Speaking on Sky Sports about the matter, Brundle believes that Red Bull are safe in the short-term, but could face challenges down the road if Horner departs the team following the conclusion of the internal investigation.
“Christian Horner has been pivotal to Red Bull’s success,” he said. “I know nothing about the current situation. I’m as confused as anybody else in Formula 1 – what it’s all about.
“Obviously, if you take Christian out of that loop, then a vacuum is always filled with other things isn’t it?
“They’ve got momentum and they’ve got Verstappen, so I wouldn’t be too worried about their immediate performance, but down the road, you would have to say that that will create some challenges.”