The Royal Bank of Scotland confirmed that the group finance director, who shockingly resigned in December after only 10 weeks into the job, will step down from his role on 19 May and then from the board on 28 May 2014.
RBS also re-confirmed in its results statement that Ewen Stevenson will join RBS as an executive director and chief financial officer once Nathan Bostock leaves.
Meanwhile, Santander UK said that Bostock will join the bank as deputy CEO as of 19 August.
Previously, Stevenson worked at Credit Suisse as co-head of EMEA investment banking and its global financial institutions group in the investment banking division.
"I am pleased to welcome Stevenson to RBS. Stevenson has spent many years working with the world's leading banks," said Ross McEwan, CEO at RBS at the time.
"In recent years he has been a trusted adviser to both governments and company boards on the steps needed to restore confidence in financial institutions following the crisis.
"At RBS we are determined to re-earn the trust of our customers and our continued financial health is central to that task. Stevenson shares our vision for building a great customer bank and I look forward to working with him."
Stevenson takes over from Bostock who resigned, in December last year, after just 10 weeks into the job to join Spanish group Santander.
Bostock previously held several positions, including chief financial officer, at Santander and was only appointed to his RBS role on 1 October last year.