South Africa coach Rassie Erasmus believes adding Japan to the Rugby Championship would be an “interesting” proposition but fears logistical hurdles will make it impossible.

The hosts lit up this year’s World Cup with a string of daring displays before crashing out to the Springboks in Tokyo.

While Erasmus’ team are now looking forward to a semi-final showdown with Wales next Sunday Cheika steps down as Wallabies coach

As a Tier Two outfit, Japan compete annually in the Pacific Nations Cup and the Asia Rugby Championship but there are already calls for them to be admitted to the Rugby Championship to boost their development with regular clashes against New Zealand, South Africa, Australia and Argentina.

Makazole Mapimpi scored two of South Africa's three tries against Japan Makazole Mapimpi scored two of South Africa's three tries against Japan Makazole Mapimpi scored two of South Africa’s three tries against Japan

But Boks coach Erasmus is not convinced the idea will take off.

He said: “It would be interesting, I think it’s a good debate to have. Their style of play would be something interesting.

“But then all the questions, the weather, possible problems and solutions, positive and negative, I just wouldn’t know that. I haven’t really put my thinking hat on about that.