Mourinho confirmed he has been priced out of the market and will not pursue Daniel Alves after Sevilla upped the asking price for their right back to £27million.
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Chelsea instead opted to pay £3.7m for 31-year-old Belletti from Barcelona.
Mourinho: "I have closed the door of my dressing room and that's very important to me. My squad is completely closed. I know the market is open until the 31st —but not for us. We have the signings we fought for. We have the balance in the squad we need for the season.
"I have 27 in my squad and I will be happy to go down to 26. We have a very balanced squad, with two players in each position, but at the moment in the right back position we have more than two with Belletti, Johnson, (Paulo) Ferreira and (Lassana) Diarra, who is 50 per cent right back.
"Every player likes to play and not just be part of the squad. If a club show a real interest in one of our players and our player shows an interest in leaving for a better situation, we can be open for that."