Felipe Massa has suggested that Ferrari's decision to bring in Kimi Raikkonen as his replacement could backfire next year.

The Brazilian has experience of racing alongside the Finn from his first stint with the Scuderia, giving him first hand knowledge of working with both drivers.

Many expect fireworks when the two champions line up alongside each other in 2014 and Massa insisted that having two drivers who will both want number one status was asking for trouble.

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"I know both Fernando and Kimi on and off the track and I rate them as excellent drivers, but I'm afraid they will collide when sharing the team," he was quoted as telling Globo.

"I told the bosses to breathe as much as possible while they still can, because it will be hard for them to breathe next season."

Massa also suggested that he was racing for himself through the final races of the season and didn't intend to simply act as support for team-mate Fernando Alonso.

"I will not race for Alonso from now on," he said. "Right from Friday at Singapore I'll be working for myself. I will attack all the time, every lap. It's come the time to look after myself."