Jenson Button has conceded that retirement from Formula 1 at the end of the season is a possibility.
Button, 34, has raced for McLaren since the start of 2010 but his contract expires at the end of the current campaign.
McLaren is currently evaluating its driver options for 2015, with Button in contention to retain his seat, alongside Danish youngster Kevin Magnussen.
But McLaren is reportedly still chasing Fernando Alonso and Sebastian Vettel as they attempt to lure one of them to drive for the team upon Honda's return as an engine supplier from 2015.
Button, who has only missed a handful of races since his debut in 2000, admits that retirement is a possibility.
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