DUBAI, Jan 5 (Reuters) - Four top managers at National Bank of Abu Dhabi NBAD.AD (NBAD) have resigned from the lender, effective from Jan. 1, 2017, it said on Thursday.

Abdulla Mohammed Saleh AbdulRaheem, deputy group chief executive, and Qamber al-Mulla, senior managing director and chief executive of Gulf and international, had both left the bank, it said.

Saif al-Shehhi, senior managing director, UAE government and key Abu Dhabi-based clients, and Abdulla al-Otaiba, senior managing director and group head of global retail & commercial had also left, the bank said.

Reuters reported the departure of the four on Dec. 28, citing sources.

(Reporting by Tom Arnold; editing by Susan Thomas) ((Tom.Arnold@thomsonreuters.com; +97144536265; Reuters Messaging: tom.arnold.thomsonreuters.com@reuters.net))