Three-time Tour de France speaks out about the use of exemptions in cycling

"It is clear that the TUE (therapeutic use exemption) system is open to abuse."

Three-time Tour de France winner Chris Froome has described the rules allowing athletes to take drugs that would normally be banned under sport's anti-doping rules as "open to abuse" and in need of urgent reform.

In a post on his Twitter feed, Froome said he does not have a "win at all costs" approach to sport and has never pushed the boundaries of what is allowed.