BANGKOK - Thais will have a chance to catch a glimpse of their revered King Bhumibol Adulyadej when he grants a public audience on Friday to mark his 87th birthday.

The monarch will be accompanied by his queen, Crown Prince Maha Vajiralongkorn, and Princess Maha Chakri Sirindhorn at the audience at the Amarin Winitchai Throne Hall at 10.30am on Friday, The Nation newspaper reported on Wednesday.

Also present will be Princess Chulabhorn Valayalaksana, Princess Srirasmi and other members of the Royal Family, The Nation said, citing the Bureau of the Royal Household.

The Crown Prince will perform a religious ceremony to mark the King's birthday at the Emerald Buddha Temple at 5pm, the report added.

Concerns over King Bhumibol's health have mounted after he missed scheduled meetings with government ministers. The world's longest-serving monarch has recently suffered from repeated bouts of colon inflammation. He also underwent surgery in October to remove his gall bladder.