The All Blacks are well aware of the new crackdown on back chatting referees in test matches.

The IRB has made it clear that the habit of players chipping away at refs will be penalised... starting this weekend.

Only the captain will be allowed to query or comment on decisions.

Speaking after the All Blacks first training session in London, centre Conrad Smith says it won't really affect him but acknowledged that there will be some players who have to watch their mouths.

Rodney So'oialo says it shouldn't be a major issue if the players stick to the law and just play the game leaving the captain to deal with any problems.

Smith looks set to play against France next week, with Ma'a Nonu possibly being unleashed in 13 this weekend at Twickenham.

The All Blacks have Tuesday off in London, with the test team to be revealed early Thursday morning New Zealand time.