An arrest warrant over Yoon's botched martial law attempt last month was issued earlier this week and it will remain valid until next Monday, suggesting that the CIO's investigators will take actions in the next few days.
With a search warrant also in hand, they are also expected to search for any remaining evidence at his official residence in Hannam-dong, Seoul.
The CIO, an independent agency established to root out government corruption, has been reportedly in discussions with police and others to determine when and how to carry out the unprecedented arrest of an incumbent president.
Yoon's security officials are expected to block the arrest, having expressed their intent to respond in line with security protocols, raising the possibility of a standoff at the presidential compound.
The previous day, Oh Dong-won, chief of the CIO, warned that failing to comply with the arrest warrant could "result in charges of obstruction of official duties."
But Yoon's legal representatives have argued that the CIO lacks jurisdiction over the charges against Yoon and does not have the authority to investigate him, while Oh said the issuance of the arrest warrant allows it to proceed.
Yoon vowed once again to fight until the end in a handwritten message the same day.
"South Korea is now in danger due to internal and external forces threatening its sovereignty, as well as anti-government group's disruptive activities," Yoon said, vowing to "fight to the end to protect the country."
If arrested, investigators can hold him for up to 48 hours.
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