Despite an abundance of talent, Mourinho has moved quickly to assure his players that everyone will get game time over the course of the next 10 months.
"You play 60 matches a season and you cannot play with the same players every time," Mourinho told the club's official website. "In the first three weeks you have one match per week but after that the cups start, the Champions League, internationals, so you have to rotate players.
"Everybody will have a chance, nobody will feel as though they are first choice or second choice. For example, in midfield we have Mikel, Matic, Ramires, Fabregas and Van Ginkel, so everybody will play and will feel useful, important.
"On the field we have a very good balance, even with the Under-21s. For example, (Andreas) Christensen isn't selected for Monday so he played for the Under-21s against Manchester City, they will have competition even when they are not selected by me."