Dr Helmut Marko does not believe Pierre Gasly would have been able to recover his performance levels if he were left in Red Bull's line-up in 2019.
Gasly was demoted back to Toro Rosso and replaced by Alexander Albon over the summer break, but the Frenchman has regained his confidence in the sister team and secured his maiden F1 podium at the Brazilian Grand Prix.
Marko was a key factor in the decision to demote Gasly, who will remain with Toro Rosso in 2020.
"He's recovered, and now we see the real Pierre," Marko told Motorsport.com.
"We always believed in him. It was positive for him, otherwise at Red Bull Racing I think he never would have recovered."
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