Rugby legend Jonah Lomu is to become an ambassador for children's charity UNICEF New Zealand.

Lomu joins other famous Kiwi celebrities who support the charity including Hayley Westenra and Mike McRoberts, as well as global sports stars such as Novak Djokovic and Fernando Alonso.

Lomu, who is receiving dialysis after his transplanted kidney failed, said becoming an ambassador was the best way for him to help change kids' lives.

"My kids mean the world to me and I'm doing everything I can to give them the best start in life, but there are so many children around the world who are disadvantaged from the time they are born.


"It is an amazing charity doing so much in New Zealand and globally to make a difference for children - I'm so proud to call myself an ambassador.''

The 36-year-old was due to box in the Fight for Life next month to raise money for prostate cancer, but had to pull out because of his health.

He remains an ambassador for the event.