Jose Mourinho has refused to discuss potential interest in Nemanja Matic, but insists he wants more Manchester United signings before deadline day.
Mourinho is thought to want a new defensive midfielder and, amid his reported interest, Matic has been given permission not to travel on Chelsea's pre-season tour.
But, speaking on United's own pre-season tour in the United States, Mourinho said: "He [Matic] is a Chelsea player. I can't (speak about him). We have to respect the player and the club, the owner, the manager.
"We don't have our door closed. We are not happy with just Lukaku and Lindelof. We need more.
"We wanted four, so I could say 50 percent of the job is done, but I won't say that because it's so difficult. I wouldn't like to be in Ed Woodward's position, negotiating, because everything is really difficult.
"Maybe we don't get two, maybe we got one, but we need one to give us more options and balance. We have players in the squad that cannot play football for the next few months; players like Marcos Rojo, Ashley Young.
"So I don't want to say Matic or any other name because I don't think it's correct to do it."