FILE PHOTO: A view of the exterior of the Citibank corporate headquarters in New York, New York, U.S. May 20, 2015. REUTERS/Mike Segar/File Photo

CHICAGO/BENGALURU (Reuters) - Citigroup Inc C.N Chairman Mike O'Neill said on Tuesday all options were being considered for his replacement, when he will retire in the next 12 months.

The options include having Citigroup Chief Executive Officer Mike Corbat taking on the additional role of chairman, O’Neill said at the Wall Street bank’s annual shareholder meeting.

O’Neill has said is preparing to retire from Citi’s board because he will turn 72, the company’s retirement age for directors.