World number two Rafael Nadal on Tuesday reiterated his criticism of the World Anti-doping Agency's (WADA) controversial 'whereabouts' rule.

Belgian players Xavier Malisse and Yanina Wickmayer were each handed one-year bans last week for falling foul of the regulations, which require players to tell national drug-testing authorities where they will be at a chosen hour each day for a three-month period.

Nadal has been one of many top players to express dissatisfaction with the system and he repeated his call for change.

"I am the first person who wants a very clean sport, more than anyone, believe me," he said.

"The way (things are being done), in my opinion, is not the right way.

"I would love to have a few changes. I think it's too much to have to say where you are every day of your life.

"I'm always going to side with the players and defend the players. I have confidence in my colleagues and in other players. I always believe they're clean. Until the results tell me otherwise, I'm going to defend my friends."

Nadal was speaking at the ATP Paris Masters, where he is set to launch his campaign against fellow Spaniard Nicolas Almagro on Wednesday.