Jonah Lomu's mother, Hepi, will be attending the first public memorial for the All Black legend, scheduled to be held at the Lotofalei'a Tongan Methodist Church, in Mangere, South Auckland, on Sunday.
Organiser and church leader Salote Heleta-Lilo said Hepi told her this morning she would "definitely" attend the service.
Tonga's Prime Minister 'Akilisi Pohiva may also attend, Heleta-Lilo said, however he was unwell so it was unconfirmed at this stage.
"He was supposed to be here at the moment. He did confirm on Thursday [he would be attending] but at this stage ... it depends because he is not well," said Heleta-Lilo.
The service is expected to attract around 1000 members of the public to farewell the rugby great.