Medical cover responsible for two thirds of spending
More than four million pounds was spent on agency workers at Noble's Hospital in the first six months of the year.
Figures published by the Department of Health and Social Care show £4,366,507 went on agency workers to cover medical, nursing and admin services between January and June.
January saw the highest spend, with more than £900,000 needed to fund agency workers at the start of the year.
More than two thirds of the total cost has gone towards medical staff.