Hong Kong unveiled a government shake-up on Wednesday that it said was aimed at reviving the financial hub's beleaguered economy and had nothing to do with a recent controversy over Beijing's role in the city's affairs.

Director of Immigration Erick Tsang will replace Patrick Nip as head of the Constitutional and Mainland Affairs Bureau, Hong Kong leader Carrie Lam said, shortly after China's state council said it had approved the appointments.

The move comes two days after Nip apologized for conflicting statements over the role of two Beijing institutions overseeing the global financial center's affairs.