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The three time and reigning 1500m world champion Kenya's Asbel Kiprop defends his agent Federico Rosa after he was accused of doping athletes.

'I have worked with him since 2008 and I've never tested positive' said Kiprop.

Rosa is back in custody in Kenya after being charged with a number of offences relating to doping in the case of former Boston Marathon winner, Rita Jeptoo, and one other athlete.

Mr Rosa, an Italian whose family have worked in Kenyan athletics since the 1980s, denies all the charges against him.

(Image:Kenya's Asbel Kiprop celebrates winning 1500m at World Athletics Championship 2015 in Beijing, credit: Getty)