Whilst Horner was cleared of any wrongdoing following an internal investigation, Newey’s departure was reported by BBC Sport to be partly down to the saga surrounding Horner.
Former F1 driver Timo Glock discussed the departure of Newey with Sky Germany, and how it will impact the team.
“Of course the pressure is there. Following in Adrian Newey's footsteps is a big one. He said, and this is correct, that it is not just one person but a whole team that determines success,” Glock said.
“Of course Adrian Newey was a big factor in the success of Red Bull. He designed cars that won the world championship.
“The departure will leave traces and also cause unrest, even if the team will sell it to the outside world as if they have already sorted everything out and are on the right path.
“Again, Adrian Newey is the best designer in Formula 1 and his departure will hurt Red Bull even if they have good people in the background. Nevertheless, he is a key figure.”