Lawmakers will vote next month on whether Chief Executive Tung Chee-hwa should resign, as criticism of his leadership mounts amid the Sars outbreak.
Independent legislator Albert Chan Wai-yip will move a non-binding motion on May 14 calling for Mr Tung's resignation.
The vote will come a week after Legco debates a no-confidence motion on Financial Secretary Antony Leung Kam-chung over his involvement in a car-purchasing scandal that arose after his Budget.
Mr Tung has been under pressure over his handling of the atypical pneumonia outbreak, with speculation that China's leadership is losing faith in his ability.
The speculation follows the sacking last Sunday of two senior mainland officials for failures in dealing with the disease.
But the motion calling for Mr Tung's resignation is unlikely to succeed as it has not yet received support from any of the major parties.
