A team looking to win the title and challenge in the CL is not going to succeed in its mission by having Mata in the side. He's a nice guy but not good enough for where we need to be. That is being blunt. I get that he was a success in that Chelsea side but that was then, in a different style of football.. he does not suit the United style of play. We like our football to be more fast paced, which suits Mourinho too.. he plays a very direct game.
In a prime Fergie side, Mata would not get in it. He's a pretty player, will grab some nice goals here and there.. but if we want to make teams fear us, we do not want a Mata in the side.
Blueprint needs to be pace, power, technical ability, tactical awareness.. all across the pitch. A guy like him, cannot hold his own in a fast paced game.. he slows things down.
If I was Jose, I'd get rid of him, Rooney and Fellaini first thing and look to revamp the dynamics of our attack. They are the main reason why we have so few goals because they symbolise just how boring, immobile and impotent we are going forwards.