Khan has not been seen in public since he was jailed for three years in August for unlawfully selling state gifts during his tenure in office
Japanese Finance Minister Shunichi Suzuki on Friday urged all creditor nations to discuss Sri Lanka's debt restructuring, after the crisis-hit South Asian nation reached a loan agreement with the International Monetary Fund.
"It's important for all creditor nations, including China and India, to gather to discuss Sri Lanka's debt restructuring," Suzuki told a news conference.
Sri Lanka has reached a preliminary agreement with the IMF for a loan of about $2.9 billion, the global lender said on Thursday, as the country seeks a way out of its worst economic crisis since independence from Britain in 1948.