But he would not commit to a date for the forces under his control to hand over their weapons to the government, a crucial test of whether Libya after the fall of dictator Muammar Qaddafi can form a cohesive state.
Some analysts had warned that caretaker Prime Minister Abdurrahim El-Keib risked sparking a confrontation with Belhadj's supporters after he handed the defense minister's post in the new government to the head of a rival militia.
Speaking at the luxury hotel overlooking Tripoli's port where he has his headquarters, Belhadj said he had not put his name forward for any Cabinet post, and had been consulted about appointments for the most powerful jobs.
"I hope that it (the new government) will be granted all the support needed for it to carry out its tasks. I am aware of certain opinions accusing it of being imbalanced in terms of representing all regions, but we hope that it would be allowed to carry out its duties to render the country stable and secure," he said.
"As revolutionaries, we are concerned with supporting this government and all the ministers including the defense minister. We will coordinate and cooperate with the Defense Ministry ... Our relationship with the defense minister is good."
Belhadj is a former leader of the Libyan Islamic Fighting Group, which waged an insurgency against Qaddafi in the 1990s. He spent time with Islamist fighters in Afghanistan, though he said he was not allied with Al-Qaeda.
