Andrew Chan and Myuran Sukumaran of the Bali Nine could soon undergo a training program to mentally prepare them for the firing squad.

It comes with news senior members of the Indonesian government are now calling for the lives of the two Australians to be spared.

Meantime a prisoner art exhibition has been cancelled in Bali just prior to opening, with authorities saying they don't want to get involved in the politics of the Bali Nine executions.

Myuran Sukumaran was among 90 artists hoping to auction their work at the event.