He was of the view that besides the 12 countries that had voted in favour of Sri Lanka at the UNHRC, only 4 more countries were needed to call such a special session.
He advised that such a session could be used to present Sri Lanka's case to win over more members.
Ahsan's advice has come as the UN braces to announce a panel of investigators and terms of reference for the rights accountability investigation on Sri Lanka as per the last US-moved resolution adopted at the UNHRC session in Geneva in late March.
The resolution was the third in as many years censuring Sri Lanka on its lack of progress on human rights accountability and reconciliation with its Tamil minority after the 30-year civil war ended with the defeat of the LTTE in 2009.
