Thaksin Shinawatra is in a private room on the medical ward of Bangkok Remand Prison and being monitored around the clock because of four underlying health conditions including heart and lung problems, the head of the Department of Corrections said on Tuesday.

Ayuth Sintoppant briefed journalists on the department’s plans for the 74-year-old inmate after the former prime minister was brought to the prison following his sentencing to eight years in jail by the Supreme Court earlier in the day — Thaksin’s first back in Thailand in 15 years.

Mr Ayuth said the prison would provide proper security for Thaksin and ensure appropriate living conditions, food, drinking water and visits.

Since Thaksin is likely to be visited by family members, close associates and people from various organisations, he will be provided with an appropriate space to meet with them.

The room where Thaksin is staying has electric fans but no air-conditioner, with an adjoining room for doctors.

Moreover, since Thaksin is an elderly person, his health will be closely monitored to ensure proper medical care.

Doctors from the Department of Corrections Hospital have examined Thaksin and found him to have four underlying diseases, including heart and lung problems.

It has been widely speculated that the former premier wants his stay behind bars to be as short as possible. He is eligible to apply for a royal pardon from his first day in jail.

When a petition is submitted, it will be considered by the Department of Corrections. The committee will then send it to the Justice Ministry and the prime minister before being forwarded to His Majesty the King for consideration.

The entire process may be completed in one to two months.

If a pardon is not granted, the applicant has to wait two years before seeking one again.