Former Formula One world champion Jacques Villeneuve has claimed Ferrari driver Kimi Raikkonen is "overrated".
Raikkonen faces a lot of pressure after his switch from McLaren
Villeneuve says the Finn lacks the all-round ability to replace seven-time F1 title winner Michael Schumacher.
The Canadian told F1 Racing magazine he believed the role of team leader at Ferrari will be taken by Felipe Massa
"Kimi's overrated as a driver package, because apart from jumping in a car and going fast, he really doesn't care about the rest," he said.
"A complete driver will spend time with the engineers, setting up the car and pushing the team.
"In a way it's good for F1 to have a driver like that - you can't just have robots. But you never know how dedicated he is.
"He'll look good, then have the odd race where he's somewhere else. You can imagine him saying, 'Okay, I'm done with F1, bye' for no reason."
Villeneuve, who will drive for Peugeot in this year's Le Mans 24-hour, partnered Massa at Sauber in 2005 and is a big fan of the Brazilian.
"If there are no fireworks with Raikkonen and Ferrari then it'll be fine, but only if Felipe manages to drive the team," added Villeneuve.
"Then Kimi can do a few quick races. But he cannot drive the team. Massa will probably take over as team leader.
"He did a really strong job last year, made a few mistakes, but didn't look too shabby next to Michael.
"He's intelligent, talented, quick. With the right equipment, he can be a title contender.
"Then we'll see if he's really a great, or just a good driver. But he could be great."