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The Grand Mosque in Makkah. It is common for Saudi Arabia to withdraw the tourist visa after the Haj season to make sure visitors don’t stay indefinitely in the country. Image Credit: Rex Features

Riyadh: Saudi Arabia's King Abdullah Bin Abdul Aziz has appointed the second deputy prime minister to oversee the Haj, the state news agency reported on Saturday, a day after doctors ordered rest for the ruler due to a slipped disc.

Nayef Bin Abdul Aziz Al Saud, also the Interior Minister, is to oversee the annual Haj, when some two million pilgrims will gather in the holy city of Makkah.

King Abdullah, who took charge in the key US ally in 2005, is estimated to be 86 or 87-years-old.

Prince Nayef, thought to be about 76, was appointed second deputy prime minister in 2009, a move which analysts said places him in a strong position to become crown prince or king one day.

Nayef, a half-brother of the king and full-brother of the crown prince, has been in Makkah this week, supervising security arrangements for the Haj.

Crown Prince Sultan, the king's half-brother who is also in his 80s, has been abroad for unspecified health treatment for much of the last two years and diplomats in Riyadh say he has not resumed full duties. He is outside the country after leaving for what was described in August as a holiday in Morocco.

The Gulf Arab state controls more than a fifth of the world's crude reserves, is a vital US ally in the region, a major holder of dollar assets and home to the biggest Arab bourse.

Analysts say the king's appointment of Nayef to the post could avert a power vacuum in the event of serious health problems afflicting the king and crown prince.