Come on, the kid is 19 years old. You can't expect to have a calm, disciplined player who takes the easy options every time at that age. However, Sanches is physically very strong, does a lot of running, has the ability to go past people, and his defensive contribution is solid. If Mourinho can work with him an teach him some discipline, he would turn into a world class player. Can see a role for him this season as a backup to Pogba in a 4231, and together with Pogba and Herrera in a midfield trio in the toughest games. Give Carrick a new contract, play Herrera as a defensive terrier against the top teams, and bring in Renato Sanches instead of a new defensive midfielder.