Lomu died suddenly this week, aged 40, after a holiday in Dubai.
Former All Black coach John Hart spoke on behalf of the Lomu family outside the All Black great's home at a media conference this morning, with Lomu's mother Hepi, rugby legend Michael Jones and other family members also appearing.
Hart confirmed there would be a public service, followed by a private funeral at the family's church.
He said details of the venue and time should be announced in the next 48 hours, with discussions being held between family, rugby officials and the government over the details.
It will not be a state funeral, Hart said, but it will be a "substantial" event.