Montezemolo insists Mattiacci is the man for the job.
Apr.17 (GMM) Luca di Montezemolo has played down rumours Marco Mattiacci is only a stop-gap solution at the top of the Ferrari team.
It is rumoured Gerhard Berger or Ross Brawn are the more likely long-term successors following Stefano Domenicali's sudden resignation.
Flavio Briatore has already ruled himself out. "I have another job," he told La Repubblica newspaper.
Ferrari president Montezemolo, however, rejected the rumours, insisting Mattiacci is the man for the job.
"He will already start to make a difference at the Chinese Grand Prix," he is quoted by the Ansa news agency.
Italian Briatore, the former Renault team boss, said he backs Domenicali's exit.
"They needed to shake things up," he told La Gazzetta dello Sport. "You can't keep saying 'we're looking ahead to next year'.
"Stefano is a hard worker, but F1 is a competition and results are what matter. There can be no excuses when you have a driver as good as Alonso," he added.
Briatore also played down criticism that Mattiacci will struggle in the F1 paddock due to his lack of experience.
"When I arrived at Benetton," he is quoted by Repubblica, "I was selling t-shirts. He has been selling Ferrari cars."