Giggs has no managerial experience, it'd be a massive risk for Man Utd to let him become manager of the 1st team. I don't think Mourinho will be sacked yet any way.
maybe yes he has no managerial experience, but look at what zidane have done to Real Madrid, is he have a managerial experience? and he give a 11th champions league trophy to Real Madrid. How if Ryan Giggs become another Zinadine Zidane?