Alfa Romeo’s return to Formula One shows the value of the sport and suggests Ferrari will not follow through on threats to leave, according to Red Bull principal Christian Horner.

Alfa Romeo is part of the Fiat Chrysler group whose chief executive Sergio Marchionne is also the head of sportscar maker Ferrari, who are Formula One’s most successful and glamorous team.

The Swiss Sauber team announced on Thursday that the Italian marque was returning to the sport as their title sponsor after a 30-year absence, with the team to be known as Alfa Romeo Sauber F1 from next season.

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