Media coverage of BDO's warning on March 1 prompted immediate questions from financial regulators, a March 6 letter to Reuters from Revolut shows.
The letter did not address the banking licence application nor its status.
"I would be astonished if the regulators go ahead with the banking licence," he added.
Revolut applied for a banking licence about two years ago.
With a banking licence, Revolut would become a more established player in the U.K. banking market and be able to draw more customers.