"When the day comes, we will seize the ruling power immediately based on the constitutional provision that the sovereign power belongs to the Thai people," Suthep Thaugsuban, secretary of the People's Democratic Reform Committee (PDRC), said after a meeting with his allies on Saturday.
"That'll be the day we can appropriately announce ourselves the sovereign because the power now returns to the people. Our words will be law.
"Once we become the sovereign, we'll seize the assets of the Shinawatra family members. We won't allow them to go abroad. They will need to report to us. We will appoint the prime minister of the people and submit the name to His Majesty, to be countersigned by me.
"After that, we'll set up the People's Council, which will lead reform before the country can proceed with a fresh election." he said.
"The PDRC will not set up a political party and we won't allow our name to be used politically. Our duty is to protect the country's interests. After the victory we'll go back home. It's either victory or defeat — there's no middle ground in this battle."
He asked the PDRC's allies to prepare for the important day by registering healthy people to reduce the burden on medical staff.
Those who cannot join are asked to send supplies and clothes because the fight will last at least 15 days, he said.
The signal will come from Mr Suthep himself and will hinge on one of the two scenarios, whichever comes first.
The first scenario is when the National Anti-Corruption Commission charged Ms Yingluck with dereliction of duty for her involvement in the rice pledging scheme.
The other is the Constitutional Court's ruling to impeach her for transferring National Security Council chief Thawil Pliensri.