More authorisations could be issued for financial institutions to come to Ireland from the UK.
It comes as worries grow about a no-deal Brexit, with Britain's end-date set for March 29th.
Martin Shanahan, the head of IDA Ireland, told the Financial Times: "The expectation is that between now and the end of March we will see more of those [approvals for financial groups] coming through".
He also highlighted the decision facing financial groups that until now have relied on the EU's passporting rights to sell products elsewhere in the bloc from UK bases.
He said that Brexit was directly linked to 55 new investment projects in Ireland that could create more than 4,500 jobs.
He added that because of the uncertainty "a lot of companies" were "progressing [with relocation plans] regardless of what the outcome is going to be now".
His comments come after a number of high-profile companies have moved their legal status from the UK to Ireland.
British bank Barclays has said it plans to double its Irish workforce by the end of 2019.
Last month the bank confirmed an expansion of operations to make Ireland a "central hub" for its European business.
It also opened a new head office in Dublin city, which it said will facilitate the "ongoing growth" of its operations here.
While Bank of America announced the successful completion of a cross-border merger of its UK banking entity into its Dublin operations.
Bank of America has already made the move | File photo
This means its Dublin operation is the company's principal European banking entity - operating through branches in Amsterdam, Brussels, Frankfurt, London, Madrid, Milan, Paris and Zurich.
The Irish capital was chosen as the company's "preferred location" back in July 2017.
It is known as Bank of America Merrill Lynch International Designated Activity Company (BAMLI DAC).
Back in June, the IDA announced that Ireland had won more than 40 Brexit-related investments over a two year period.
IDA half-year results showed the country won 139 projects in the first six months of the year - compared with 114 in the first half of 2017.
There were 51 regional investments, with technology, financial services and pharmaceuticals performing strongly.
The IDA said it expected investments approved in the first half would lead to the creation of over 11,300 jobs, compared with 11,000 over the same period in 2017.