O'Byrne joined HSBC as Group General Manager and Chief Operating Officer of the unit in 2017, responsible for the delivery of strategic change initiatives, data and analytics, middle office and the leadership of regional chief operating officers, HSBC said in a statement.

He will join HSBC's group Management Board in his new interim position, which is subject to regulatory approval.

Quinn replaced John Flint, who resigned earlier this week after just 18 months in post.