According to the Central Vigilance Commission Act when the Central Vigilance Commissioner is unable to discharge his functions owing to absence on leave or otherwise, such one of the Vigilance Commissioners as the _________ may, by notification, authorise in this behalf, shall discharge the functions of the Central Vigilance Commissioner until the date on which the Central Vigilance Commissioner resumes his duties

Section 10. Vigilance Commissioner to act as Central Vigilance Commissioner in certain circumstances: (2) When the Central Vigilance Commissioner is unable to discharge his functions owing to absence on leave or otherwise, such one of the Vigilance Commissioners as the President may, by notification, authorise in this behalf, shall discharge the functions of the Central Vigilance Commissioner until the date on which the Central Vigilance Commissioner resumes his duties.