Questions for Man United players after World Cup

The World Cup is over and Manchester United's pre-season has begun, although neither has happened in quite the way we wanted... there are some interesting things to learn about Lisandro Martinez and Marcus Rashford after they saw out contrasting 45-minute shifts over the weekend. Kobbie Mainoo didn't get a single minute from Thomas Tuchel... hopefully his back isn't too sore when he returns to…