Cronulla and Penrith will kick off the NRL's five-week experiment with interchange referees next season.

The NRL announced the five games which will be played with the system in place in 2005, albeit with a rider that the concept could be scrapped early if it isn't working.

Penrith coach John Lang was unfazed by the prospect of his side being the guinea pig in the NRL's latest refereeing experiment.

"I think you just have to worry about yourself - I have always had that attitude," Lang said.

"It seems to work pretty well for us. I think you can get too smart worrying about what the referee is going to do."

The other games which will be played with interchange referees will be:

- St George Illawarra-Melbourne game at WIN Stadium in round two;

- South Sydney v Canberra at Aussie Stadium in round three;

- North Queensland against Newcastle at Dairy Farmers Stadium in round four; and

- The Brisbane-Parramatta match at Suncorp Stadium in round five.

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