Health officials were told in September last year of a possible €400m overrun at the National Children's Hospital.
The Government has consistently said it was only made aware of the final €450m overrun in November 2018.
However, newly released minutes from the Hospital Project Board show Department of Health and HSE officials were told in September 2018 about possible cost overruns of €391m.
The news comes as it was confirmed that the Public Accounts Committee will ask the head of the Department of Public Expenditure as well as one of its top officials to answer questions about the spiralling costs for the national children's hospital.
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