Martin Brundle has questioned Ferrari's threat to quit F1 over proposed engine rule changes

Ferrari chief Sergio Marchionne has threatened to pull his team out of F1 due to engine rule changes proposed by Liberty Media.

And he’s come in for plenty of flak for that warning, with pundits suggesting Ferrari needs the sport as much as it needs them.

Brundle has now added to that chorus, suggesting that competing in F1 is best for the Italian constructors’ brand and hopes of being successful.

"I think they're bluffing," Brundle told Sky Sports' F1 Christmas Special.