All Black great Jonah Lomu's transplanted kidney has failed, leaving him needing intensive dialysis and another new kidney to survive.
Lomu has had to spend time in hospital and is now 30kg lighter than when he launched the Rugby World Cup in September.
Kidney disease forced a transplant eight years ago but in October that organ - donated by his friend and radio host Grant Kereama - stopped working.
Lomu, 36, revealed in this week's New Zealand Woman's Weekly that he was ill again and the transplanted kidney had not responded to treatment.
"We were hoping to see some improvement but nothing has made any difference, so the next step is to try to find a donor."