AIB will raise money by selling an unguaranteed three-and-a-half year bond.
It's understood the bank has told the market that the money will be raised in the near future subject to market conditions.
The bank has mandated Barclays, Deutsche Bank, Morgan Stanley and UBS to raise money on behalf of the State-owned lender.
That could mean that the bank would raise money in the coming days possibly tomorrow.
Observers say the development is a further sign of Irish banks regaining access to the markets.
AIB raised €500m in November last year using an unguaranteed bond.