The Health Information and Quality Authority says it has given Tallaght Hospital two weeks to produce a governance and quality improvement plan, following the controversy over X-ray reviews and unprocessed GP referral letters.
In a statement, the authority said it must assure itself, patients and the public that the hospital is providing good, safe care.
The authority is to hold regular performance monitoring meetings with the hospital to assess how it is dealing with the X-ray backlog and problems with GP referral letters and says it will also monitor how the HSE is dealing with the issues.
HIQA said it will be seeking a regular progress report from the HSE review into what went wrong at Tallaght Hospital and will require immediate notification should any further patient safety issues be identified during the review.
The review will be chaired by Dr Maurice Hayes, former Northern Ireland Ombudsman, and the terms of reference are expected to be announced this week.