Christian Horner says having "two alpha-males doesn't work".
Red Bull boss Christian Horner says it's highly unlikely they'd re-sign Sebastian Vettel as having "two alpha-males doesn't work".
The German won his four world titles with the team before moving to Ferrari, whom he will leave at the end of the season.
Horner doesn't feel having him back would be good for the team dynamic.
Martin Brundle believes there's a good chance Sebastian Vettel might retire at the end of the current Formula One season.
It follows Ferrari's announcement that the four time world champion will be leaving the team at the end of his contract.
Brundle says the German may have no other option than to walk away from the sport.