By Josh O’Brien Manchester United are weighing up the idea of paying off Casemiro the rest of his contract in a bid to move him on as soon as possible. The five-time Champions League winning midfielder arrived at Old Trafford 18 months ago from Spanish giants Real Madrid in a deal worth £60million on a four-year contract. Less than two years into that agreement, United are now believed to be mulling over the idea of cutting ties with Casemiro and starting their midfield rebuild afresh. The former Los Blancos regular enjoyed a standout debut campaign and was viewed as a signing of the season ca…