JPMorgan Chase is looking for additional office space in Dublin and is also considering occupying property in Amsterdam after the Brexit vote, according to a report from Bloomberg.
Citing people with knowledge of the matter, the financial news agency said the bank may lease or acquire about 100,000 square feet (9,300 square meters) of extra office space in Dublin.
That is enough for about 770 workers based on typical modern office use.
JP Morgan Chase last month agreed to pay about €125m for an office building in Dublin - Capital Dock - which is under still construction, according to a person with knowledge of the plan.
That property could accommodate over 1,000 workers and is due to be finished in the third quarter of 2018.
"We continue to evaluate our real estate strategy across Europe so we can support our clients in any scenario," Jennifer Zuccarelli, a spokeswoman for JPMorgan, said.
"As we have said before, we will use the three banks we already have in Frankfurt, Dublin and Luxembourg as our legal anchors," she added.
The bank already employs 500 people in Dublin's International Financial Services Centre.
Chief executive Jamie Dimon told UK staff before the Brexit vote that as many as 4,000 of them could be relocated if the referendum passed.
In January, he said that number could be even higher - or lower - depending on how the Brexit negotiations play out.