Arman said on Twitter he had been deported by military helicopter and has also claimed the three of them were tied up during the flight.
"I came together with comrade Ismail Khamis Jalab and comrade Mubarak Ardol".
Meanwhile, the US State Department on Monday said it plans to send its top diplomat to Sudan this week to urge talks between the TMC and opposition leaders.
Opposition sources have said that an aide of Abiy had been shuttling between the two sides trying to broker a deal after his one-day visit to Khartoum.
They didn't stop until al-Bashir was forced out by his military generals in April, ending three decades of autocratic rule.
But pro-democracy campaigners say the military council can not be trusted after Monday's crackdown against a sit-in demonstration in Khartoum - and they have rejected an offer of talks.
Yasir Arman addresses the media in Juba, South Sudan, on Monday.
Protesters had set up roadblocks across many areas of the capital that the ruling generals have vowed to remove in order to return "life to normal".
On Monday, there was a little more movement on the streets and some shops had begun to reopen, including in Khartoum's central market, but many stores and businesses remained closed.
"If I work it does not mean that I don´t support the revolution", said bus driver Abdulmajid Mohamed.
"The Military Council has made a decision to reinforce the presence of armed forces, RSF and other regular forces to help normal life return", the council member said, including the feared Rapid Support Forces, blamed by witnesses for the killings last week as a sit-in protest outside army headquarters was cleared.
"I have to work to support my family or else we will have no money".
Opposition doctors say at least 118 people have been killed since the raid on the sit-in a week ago.
The generals have blamed protesters for a deterioration in security in Khartoum and across the country.
Also on Monday, Deputy U.N. spokeswoman Eri Kaneko told reporters in NY that the military council had decreed to the African Union-U.N. peacekeeping mission in Darfur to hand over its premises to Sudan's Rapid Support Forces (RSF) as part of the mission's withdrawal in 2020.
Sudanese women rights defender Nahed Jabrallah told DW Arabic last week that she witnessed the RSF threatening to rape both women and men during the assault. Social media users with access to a connection reported that the country's internet was blocked by the ruling military government.
But protesters remained outside army headquarters in Khartoum to demand that the military council hand over to civilian rule, before they were dispersed in a crackdown that left dozens dead. The health ministry says 61 people died nationwide on June 3, including 49 by "live ammunition" in Khartoum.
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