Yoon's legal representative had requested that the decision on detention be revoked, citing that the indictment was submitted after a deadline.
A court in Seoul is now assessing that Yoon's representative may be right regarding the deadline. Therefore, it is essential to ensure that the process takes place in a clear and correct manner, "to dispel doubts about the investigation's legality," the court announces, according to the news agency Yonhap.
Yoon Suk-Yeol is charged with leading a suspected attempt at a coup d'état in South Korea, since he declared a short-lived state of emergency in the country in early December and sent military forces to the parliament.
He denies the allegations and has insisted that as head of state, he has the authority to impose martial law.
Yoon was arrested in a large police operation on January 15, after he had refused to appear before the authorities for two weeks and instead barricaded himself in his residence.
The 64-year-old's presidential powers were revoked when he was brought before the impeachment court on December 14. In the final stage of the impeachment process, South Korea's Constitutional Court will decide whether he should be completely dismissed.
In the criminal proceedings, a guilty verdict can lead to a maximum sentence of life imprisonment or the death penalty.
