An unnamed source told The Sun: “This is a shocking breach of security and some serious questions will be asked as to how this was allowed to happen. Fortunately, there was nothing sinister to this incident. It was just a prankster, who’s actually a United fan, being silly and wanting to hear what was said inside those four walls. But it will definitely be a cause for concern about how they managed to get inside a changing room at one of the Premier League’s biggest clubs just days before a match.”