Health minister Lord Ara Darzi is quitting his post as health minister.

Lord Darzi will return to surgery but remain an adviser to the government.

HSJ understands a government announcement is expected tomorrow.

Lord Darzi, a surgeon at Imperial College Healthcare trust, was appointed a minister in 2007.

Lord Darzi was appointed by prime minister Gordon Brown as part of his “government of all the talents” initiative.

HSJ understands the resignation is being attributed by the government to his workload as both a minister and surgeon. He is said to be working about six and a half days a week.

Lord Darzi’s official leaving date will be 21 July, the beginning of the summer Parliamentary recess, it is understood.

He led a year-long review of the NHS and published High Quality Care For All in June last year.

Last month Lord Darzi told HSJ there was “absolutely” no substance to rumours he has been unhappy with the political aspect of his role.

Asked what he would be doing this time next year, he made it clear he expected not to be a minister: “The people who will make change in the NHS are not here [in the Department of Health] they are out there. And I will be with them doing my work.”