Casemiro was introduced as a Manchester United player before the club's home game with rivals Liverpool on Monday after joining from Real Madrid.   United will pay up to £70m for the Brazil midfielder, who has signed a four-year deal at Old Trafford.       Casemiro says he is joining "the biggest team in the world" after bidding an emotional farewell to Real.   The 30-year-old becomes one of the top earners at Old Trafford but he says the move is not motivated by money.   "If it was about money I would have left four or five years