Mourinho said English internationals (Smalling, Rooney, Rashford) will go to China, but won't play any games. I suppose the same logic should apply to other internationals, like Darmian or Fellaini. And perhaps those who finished their duty early will be able to play, like the Copa America guys Romero, Rojo (probably not), Valencia, and De Gea, McNair, Ibrahimović…
But some – those still competing, like Martial, Schneiderlin, Pogba (or Matuidi, hopefully), or Schweinsteiger (if he recovers from his knee injury) – might even be on vacation during the tour. It's a very tricky situation for an incoming manager, not having all those players to play those big (friendly) games agains Dortmund and City.