According to Sky News, Atom is in talks with Citi over a potential appointment to discuss its options.
Atom Bank recently raised almost £150m from investors led by BBVA, which already owns around 40% of the digital bank.
Insiders say BBVA now has the option to acquire the remainder of the shares, with a takeover 'likely' during 2019.
If BBVA doesn't acquire Atom Bank, a further private fundraising or stock market listing is expected to take place later in the year.
Atom launched in 2016 and has since taken over £1.3bn in customer deposits.
Atom declined to comment on the appointment of Citi.
