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However, no date for the proposed congress has been announced.
The three leaders have issued a joint statement aimed at continuing the Syrian peace talks and finding a sustainable solution for the post-conflict period by convening a "Syrian National Congress of Dialogue," reported CNN, citing Putin as saying.
In a joint statement they urged the Syrian government and opposition to "participate constructively".
"The congress will look at the key questions on Syria's national agenda including working out a political organisation and the endorsement of a new constitution" and "the organisation of the new elections under the auspices of the UN", Putin added.
This came days after he hosted his Syrian ally, President Bashar al-Assad.
Bashar al-Assad, during a visit to Sochi earlier this week, stated that he was "totally committed" to a peaceful solution.
Putin told Assad that the military campaign was "wrapping up", but there was still "a long way to go".