Jenson Button has sustained hairline cracks in his ribs following a karting accident. The Englishman was karting as part of his winter preparation when the crash occurred. Button, although unphased by the incident, will be unable to test again this year to allow his ribs time to heal.

Rubens Barrichello will replace Button during testing, with fellow test drivers Christian Klien and James Rossiter. At this stage it is unclear whether another driver was involved in the incident, or whether Button may have lost control following a late morning health shake binging session!

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