The review into the shelved Newsnight report into Jimmy Savile's abuse is to take about a month longer than expected.
The need to conduct further interviews, examine documents and prepare the report will mean it is not expected to be delivered until mid-December.
Former Sky News boss Nick Pollard, who is chairing the review, said it was making "good progress".
Amid the fallout from the Jimmy Savile scandal the BBC is investigating nine allegations of sexual harassment among staff and contributors.
BBC boss George Entwistle has spent almost two hours taking questions from MPs about the corporation's handling of the Savile scandal.
Ex-BBC boss Mark Thompson has told ITV News he will help with any inquiry into the corporation and its handling of the Savile allegations.