Jose Mourinho admits Manchester United's preparation for the derby with Manchester City will be hampered by the international break.
A large proportion of the United squad will be away with their respective national teams over the next week.
"We keep eight outfield players and Sam Johnstone as the goalkeeper [for training]," the manager told MUTV.
"We are going to lose the others and we don't know the way they train, the way they recover, the life they are going to have with their national teams.
"Some are coming back on the Monday before the Manchester City match but some are coming back on Friday. The day before Man City, we will still have Sergio Romero, Marcos Rojo and Antonio Valencia arriving.
"It will be a complicated process but we know it is like this when we have these players. And I would love all of the players to go because it would mean that everybody is being selected for their national teams."
"I give the other guys, who are not selected for the national teams, two days off," said Mourinho.
"And I give four days to Zlatan. At 34 years old, you need to rest."
