"The Alliance for Freedom and Change (AFC) will reveal its sovereign council and a prime minister in an announcement to be made at a suitable time," the Sudanese Professionals Association, a key member of the umbrella protest movement, said late on Monday.
The crackdown by the military came after negotiations between protest leaders and the generals collapsed late last month over who should lead the new governing body -- a civilian or a soldier.
The AFC said the disobedience campaign "clearly shows that the Sudanese people are rejecting the military council and its militias and they have lost their legitimacy".
Since toppling longtime President Omar al-Bashir on April 11, the generals have resisted demonstrators' demands, backed by Western and most African governments, to make way for a civilian-led transition.
The US assistant secretary of state for African affairs, Tibor Nagy, plans to meet both the generals and protest leaders in Khartoum, the State Department said.
He is to leave on the trip on Wednesday and also visit Addis Ababa to discuss the Sudan crisis with Ethiopian leaders and the African Union.
"He will call for a cessation of attacks against civilians and urge parties to work toward creating an enabling environment" for talks to resume, the State Department said on Monday.
The United States has led calls for a civilian-led transition even as its Arab allies Egypt, Saudi Arabia and the United Arab Emirates have backed the generals.
The military-led government has blamed deteriorating conditions in Khartoum on the protesters' disobedience campaign, which has seen makeshift barricades thrown up in a number of districts.
"We are appealing to those who blocked the roads to open them for all the sick people ... since many people lost their lives because they cannot reach the hospital," senior health ministry official Mohamed Altom told reporters during a tour organised by the ministry.
The generals said they will reinforce security forces on the ground.
"The military council has decided to reinforce the presence of armed forces, RSF and other regular forces to help normal life return," a general said late on Sunday.