Justice Cameron Mander heard today that the new charges came about after three more women came forward to police and made complaints.
Detectives are also working to identify four other women who feature on "material" found on Muchirahondo's phone.
"They were depicted in videos found on Mr Muchirahondo's phone," said Crown prosecutor Claire Boshier.
"Inquiries are under way to identify these women."
In total there are 15 separate complainants - including the four women yet to be identified.
Muchirahondo is scheduled to stand trial in February 2023.
That trial is set down for five weeks.
Muchirahondo, well known in the football community, is alleged to have met the complainants at parties and nightclubs in Christchurch.
The alleged offending, uncovered during a police investigation dubbed Operation Hope, happened between October 2018 and February 2021.
Detective Senior Sergeant Nicola Reeves earlier urged anyone else with concerns about Muchirahondo to come forward to police.
"Please reach out to us," she said.
"We would like to reassure those who come forward that the information they provide us will be treated with sensitivity.
"Anyone with information is asked to contact the investigation team by calling the police 105 number and quoting file number 210221/7752.
SEXUAL HARM - DO YOU NEED HELP?
If it's an emergency and you feel that you or someone else is at risk, call 111.
If you've ever experienced sexual assault or abuse and need to talk to someone contact the Safe to Talk confidential crisis helpline on:
• Text 4334 and they will respond
• Email support@safetotalk.nz
• Visit https://safetotalk.nz/contact-us/ for an online chat
Alternatively contact your local police station - click here for a list.
If you have been abused, remember it's not your fault.
