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The French scientist behind research that suggests British cyclist Chris Froome's performance could be drug-enhanced has been defending his work.

Froome is currently wearing the yellow jersey in the Tour De France, but some in the French media say analysis of his cycling indicates it could be performance-enhanced.

The man who has carried out that research is Dr Pierre Sallet, head of the organisation, Athletes for Transparency, which describes itself as a not for profit anti-doping agency.

Speaking to 5 live's Phil Williams in his first British interview on the subject, Sallet says there are only three ways to explain his data analysis of Froome's power-to-weight ratio: 1) a 'unique' physiological profile; 2) 'classical doping ... I mean, using haematological drugs', like EPO; or 3) 'mechanical doping', which could include 'using a motor in your bike'.

His research has been presented to Team Sky boss, Sir Dave Brailsford, who denies that Froome's performance is as a result of using drugs. Froome also rejects the allegations.

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