China has extended its review of Marriott International Inc's acquisition of Starwood Hotels & Resorts Worldwide Inc by up to 60 days, the companies said on Monday.

The Ministry of Commerce review is the only remaining merger clearance for the deal, which is expected to create the biggest hotel group in the world with a combined enterprise value of $36 billion and 1.1 million rooms.

Hilton Worldwide Holdings, which would be No 2 behind the combined group, has 775,000 rooms.