The HSE expects to begin vaccinating children aged between 12 and 15 within the next two weeks.
Chief Clinical Officer Dr Colm Henry told RTÉ News that the HSE is working on some outstanding logistical issues before opening the portal.
”We’ve got to prepare the consent forms that parents will need to consider and make the right decision for their child,” Dr Henry said.
The HSE is also looking closely at the information it will give to the public regarding the efficacy of vaccines and the benefits for children.
The Executive’s IT systems are also being re-tooled to accommodate this new age group.
Approximately 280,000 children aged 12-15 will become eligible for the Pfizer vaccine following updated guidance from the National Immunisation Advisory Committee.