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Ahead of Chelsea's Champions League clash with FC Basel, Mourinho told the Evening Standard:
There is one thing that is obvious, which is I can't change the rules and I can't start the match with 12, 13 or 14. I'd love that because many people deserve to play and Juan is one who deserves to play because of the way he works, behaves, the way we see him every day. But if I play him and I don't play (Eden) Hazard or Oscar, you are asking me about Hazard or Oscar in this moment. It's a consequence of the squad we have where, for these three positions behind the striker, we have so many options. It's hard for me. I don't have a special pleasure leaving players out. I enjoy playing them and making them happy, but there's nothing I can do.
This certainly indicated that Mata's exile will likely continue.
However in his post-match press conference, Mourinho indicated that he would need the full strength of his squad during the hectic Christmas period. Dominic Fifield of The Guardian had this quote from a disappointed Blues manager.
It's not the kind of game where I'm very upset with the players because I think I get it: I understood. Maybe I should have made more changes from Saturday, but when the team's played so well, you want to give them more confidence, you want them to keep that going. But I could see many signs of fatigue. I'd spoken with all of the players individually before I made the team decision, and all of them had told me they were perfect to play. They wanted to play. They'd recovered well from the international week and Saturday, but the reality is they weren't. In positions where I had other solutions, probably I should have changed the team. Today is a day when I'm disappointed, not upset with the players.