Concerns that have arisen have been fundamentally related to training and rehearsals.
McDermotts partnerGraziano Di Primahas left the show after allegations of gross misconduct.
He has apologized and said he deeply regrets the events that led to his exit.
Strictly Come Dancing: Zara McDermott (middle right) with Graziano Di PrimaBBC/Guy Levy
Pernice denies all reports of inappropriate behaviour, and the BBCs investigation is continuing.
Strictly Come Dancingis one of the BBCs most popular TV shows, often topping its annual most-watched list.
