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Mark Webber has cast doubt on whether Fernando Alonso will see out the entire 2017 F1 season if McLaren-Honda's troubles continue to stall his campaign.

The former F1 race winner, who has a famously strong friendship with the Spaniard, sees Alonso jumping ship at the Woking-based team if it can't cure its unreliable and uncompetitive power unit and MCL32.

Alonso slammed McLaren-Honda during pre-season testing, pointing the finger at Honda for being 'the only reason' McLaren wasn't fighting at the sharp end of the F1 grid.

ANALYSIS: Have F1's worst fears been realised in 2017?

After retiring late on in the season-opening Australian Grand Prix, Alonso once again turned on his team by saying McLaren would be finishing 'last place' in terms of pure pace.

Speaking to Belgian news agency Sporza, Webber believes Alonso could break from his McLaren-Honda contract early in the hunt for a winning drive having lost patience with his current set-up.

"Maybe Fernando's not there the whole year..." Webber said. "Fernando might not do the whole year. He's frustrated like hell, he doesn't even want to finish seventh or sixth.

"It's not like Stoffel [Vandoorne], maybe points for him is quite nice. Fernando's not interested in points, he wants to be fighting for podiums. So mentally he's a long, long way away from where he wants to be."

McLaren had reportedly approached Mercedes about switching to their power units after the dismal display at pre-season testing in Spain but in Australia both McLaren and Honda showed a united front to shoot down the rumour.

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