Taoiseach (Irish Prime Minister) Leo Varadkar joined the medical register and offered to work in teams to help health services during the coronavirus crisis.
Mr Varadkar worked as a hospital doctor and general practitioner before being elected to the Dáil (Irish Parliament).
He left the medical profession in 2013, a year before being appointed Minister of Health.
But he re-registered as a doctor last month, reported the Irish Times.
The newspaper said that Mr. Varadkar should work weekly shifts in an area suited to his qualifications and that he “would assist in telephone assessments”.
The move follows an appeal by the Irish Health Service Executive (HSE) to ask former health care workers who left the profession to sign up for work during the pandemic.
Varadkar, 41, is the Dublin-born son of an Indian doctor and an Irish nurse.
In the Republic of Ireland, the deaths of 21 other patients who had Covid-19 were confirmed on Sunday, bringing the total number of deaths to 158.