A stunning start to 2024 catapulted both Red Bull and Max Verstappen to the top of the championship standings, but a huge decline in performance allowed a number of teams to catch up to the reigning champions.
Several rows broke out within the Red Bull team at the start of the year, following an internal investigation into Horner's conduct which cleared him of any wrongdoing, with Jos Verstappen publicly berating the team principal and Helmut Marko's future with the team called into question.
Despite announcing his departure earlier in the season, Newey did still work for Red Bull for a number of months, mainly focusing on their hypercar project.
Now, Horner has stated that the legendary design chief did not have a single bit of input on the design of the upcoming 2025 car, as the team hope to get themselves back above Ferrari and McLaren.
"This is the first time that Adrian will have had absolutely no input into the car," he told Sky Sports F1, via RacingNews365. "That’s for the team to step up to that challenge.
"I’m confident they can do that. They've got strength and depth and we’ll see what the RB21 looks like when it's unveiled at the end of January."