Lomu has not played for the All Blacks since last November Feature: What now for Lomu?

The father of Jonah Lomu fears his son may be risking his life if he plays for New Zealand in this year's World Cup.

The All Blacks wing has a serious kidney condition which now requires dialysis three times a week.

But he has spoken of his determination to play rugby again and has targeted a comeback in August ahead of the World Cup in October.

But Lomu's father Semisi said: "Our family is extremely worried for him - the World Cup is not worth his life."

Semisi Lomu said he did not agree with Jonah's assessment of his health improvement since he began dialysis treatment last month.

His son suffered kidney failure as a result of the rare illness nephritis and is on a waiting list for an organ transplant.

Semisi Lomu said: "I've always dreamed of Jonah being in a World Cup-winning All Black team.

"That's always been his dream, too. But right now I would rather seem him get back to good health than see him holding the World Cup.

"He needs to turn his mind off rugby and the World Cup and focus solely on getting better. He's thinking too far ahead."

Lomu Snr added: "He is not the Jonah I know - I've seen him break into tears. Jonah is not usually like that."