Alain Prost has warned Ferrari that they must control their embattled drivers or risk handing another world title double to Mercedes next season.
The four-time world champion, who was embroiled in one of Formula One's fiercest in-team rivalries when he and Ayrton Senna were team-mates at McLaren in the late 1980s, said Ferrari faced a "complicated situation of management".
The Frenchman said he could foresee the battles between four-time champion and team leader Sebastian Vettel and young pretender Charles Leclerc costing them the title and handing it to Mercedes again.
"With his experience, Vettel was considered the number one in the team, so it;s hard to manage that," he told BFM TV. "I think it's going to be difficult, especially next year.
"I think Ferrari will be strong next year and they will have to deal with the fight between Charles and Sebastian. If the car is good and they are both fighting over the title, that could give it to Mercedes."
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