Updated On: 20 August, 2012 07:04 AM IST | | AFP
The most successful Olympian ever, Michael Phelps was in a spot of bother following his 'unsanctioned' ad campaign for Louis Vuitton, the swimmer's agent said on Saturday.
The iconic swimmer found himself in trouble after he promoted the non-official sponsors within the timeframe surrounding the London Olympic Games, which according to a rule by the International Olympic Committee (IOC), is prohibited.

Michael Phelps during the London Olympics. Pic/AFP