The Chinese firm said in a filing to Spain's market regulator that it agreed to sell 17.64 percent of the hotel chain for 6.4 euros (5.60 pounds) per share, subject to certain conditions.

If the first tranche is completed, it will then sell a further 8.83 percent of NH for 6.10 euros per share, implying Minor will buy the stake for a total of just over 622 million euros.

(Reporting by Isla Binnie; Editing by Adrian Croft)