It seems unlikely to happen following their (ancellotti and Pep) statements regarding their future at their current clubs (City and Madrid). Pep stated that he was unlikely to stay in the city after his contract expires soon and was keen to coach the national football club. Ancellotti has also emphasized how he is unlikely to leave Real Madrid until the end of his contract. It's impossible for United to recruit them. This sounds like a cheap rumor.
Pep Guardiola and Carlo Ancelotti are currently comfortable at the clubs they manage and I don't think they will leave the club anytime soon so Manchester United has to wait for these coaches to leave their respective clubs so they can bring in one of these great coaches but I'm not sure These great coaches are willing to accept offers to coach clubs like Manchester United un less they want a more difficult challenge. Manchester Uniteden is still an elite club in the Premier League, but their glory has begun to fade and coaches must build performance from the bottom if they want to improve the club's performance.
But sorry, I don't agree with that statement your said it was impossible for Manchester United. Anything can happen if a coach wants to try to coach a club that is full of challenges. Manchester United is a big club. They need a coach with good experience to restore their success. Moreover, I have never heard of Man U experiencing difficulties. finances so if the club is able to get one of these coaches then the management will let the coach change the players according to their wishes.