MILAN: Ferrari will race in other series if they quit Formula One at the end of the year and the fans will follow them, president Luca di Montezemolo said on Wednesday.

The Italian team, the sport's oldest and most successful, said on Tuesday they would not enter the 2010 championship unless plans to introduce a budget cap are abandoned.

Toyota, the two Red Bull teams and Renault have made similar threats given that the plans would allow capped teams to operate with far greater technical freedom than those continuing with unlimited budgets.