Kevin Magnussen has fractured his hand in a training accident and the McLaren reserve driver will be absent from Singapore and is a doubt to be able to fulfil his duties for the Japanese Grand Prix next weekend.

The Danish driver posted an image of his broken hand bandaged up on Twitter on Tuesday afternoon and wrote: 'broke my hand after falling off my bicycle.'

The McLaren driver, whose future at the Woking-based team is in doubt as is it believed he will miss out on a Formula 1 race seat in 2016, is in high spirits by joking in the social media post that he 'better stick to four wheels.'

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As a result, Magnussen will not be present at the Singapore Grand Prix and is a concern for the Japanese Grand Prix a week later.

Fellow McLaren driver and GP2 series leader Stoffel Vandoorne has already flow out to Singapore and is expected to act as cover in case either Fernando Alonso or Jenson Button are unable to drive.

"Stoffel is in Singapore to do media work for Belgian TV, which arrangement was made many weeks ago," A team spokesman said. "McLaren will not have an official reserve driver here in Singapore this weekend, although Stoffel will of course base himself at McLaren and will assist us when and where required."