Niger's Defense Minister General Salifou Mody met Gnassingbe in Togo's capital Lome where he said the junta also wanted Togo to be a guarantor of a deal for French troops to withdraw from the Sahel country.
The Economic Community of West African States has imposed tight financial sanctions and closed border trade with Niger in a bid to restore constitutional order.
Mody, who called the sanctions "cynical," said Togo had allowed space for the Niger junta to communicate when other avenues were shut.
Though an ECOWAS member, Togo has taken some bilateral initiatives to engage with Niger's military leadership.
"We have never closed our country to friends. It is always important to remind our partners that Niger is open, even if arrangements have been made so that we cannot address our partners," Mody told reporters after the meeting.
"We also asked the President of the Republic of Togo to be a facilitator, to be able to facilitate this dialogue with our various partners."
France has already started pulling out its 1,500 troops from Niger after the junta demanded they leave following the July 28 ouster of President Mohamed Bazoum.
Mody said the withdrawal was going ahead with some French "air assets" being prepared for departure.
"We demanded that Togo, our brother country, for all the contribution that this country continues to give us, be our guarantor in this agreement. The withdrawal is progressing and everything is going normally," he said.
Togo's foreign minister Robert Dussey said the country was ready to assist in dialogue.
"Togo always opposes any takeover by force, Togo opposes any coup d'etat," he said. "But in the particular situation of your country, Togo understands and Togo wants to help you."
Nigeria's President Bola Ahmed Tinubu, current chair of ECOWAS, said he was proceeding cautiously on Niger because of concerns over the safety of ousted president Bazoum.
For now, the junta has demanded up to a three-year transition back to civilian rule, while ECOWAS has called for the immediate restoration of constitutional order. But Tinubu said back channels were still open.
Niger is battling two jihadist insurgencies -- a spillover in its southeast from a long conflict in neighbouring Nigeria, and an offensive in the west by militants crossing from Mali and Burkina Faso.