RBS finance director Nathan Bostock is to leave the bank to become deputy CEO at Santander UK.
Bostock will become chief risk officer and deputy CEO at Santander, rejoining the group having previously spent eight years at Santander UK and its predecessor firm Abbey National.
He had been at RBS since 2009, formerly as chief risk officer, before taking on his current role as group finance director on 1 October.
Bostock's return to Santander opens up the prospect of him replacing Ana Botin as Santander UK CEO in future, according to the Financial Times.
Two global vehicles
'Further plug advice gap'
Must appoint separate CEOs and boards
Advisers do come out well
Will report to Mark Till