"If anyone see Mr Niwatthamrong, please tell him or invite him to have a talk with Luong Kamnan", (Uncle Kamnan), as Mr Suthep has dubbed himself in recent months.
Mr Suthep also said he would welcome visits by Tarit Pengdit, chief of the Department of Special Investigation (DSI) and Chaikasem Nitisiri, caretaker justice minister.
Mr Suthep led protesters to Government House, which has been closed for months, and said he would wait for Mr Niwatthamrong there.
He said protesters would be "visiting" TV stations as well as Government House, and would welcome food and drinks from the community.
The PDRC on Friday divided into six groups heading to different locations for the 11th "final battle" to bring down the government, now depleted by Tuesday's disqualification by the Constitutional Court of ex-premier Yingluck Shinawatra and nine other ministers.
Lumpini Park stage will remain the main site of the protest for meals, evening rallies and overnight stays.