But it would be unusual for Mata not to travel at all, even if he wasn't going to play, as he'd be expected to be part of the celebrations at the end of the game, were United to win.
"The club knew what they were doing when they bring him, it is nothing new, it is something that keeps going and following him, I'm super happy for him".
He has a formidable record in the competition, having lifted the League Cup trophy three times in five full campaigns with Chelsea.
Since beating Liverpool in the EFL Cup semi-final, they have been thrashed by Arsenal in the FA Cup and lost to both Swansea and West Ham in the Premier League, before beating Sunderland 4-0 last time out.
Mourinho admitted he was more concerned about facing Saints in a major final than he would have been had Liverpool or Chelsea made it through to Wembley. "I go for the best possible team".
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Mourinho's side went into the break with the advantage, but the feeling around HA9 was that Southampton had a lot more to offer in the second period and they delivered nearly instantly.
"It's important to accept this but I am disappointed for the players and for the fans". On Sunday United conceded first at Blackburn Rovers, then calmly went about winning the FA Cup fifth round tie 2-1.
Saints boss Claude Puel is "the anti-Mourinho", says Richard Jolly of ESPN, and it could work in his favour.
But we have people who are showing to me that they want to win this match, and this match is what matters now.
As a result, United will have to be on form if they are to break down the Southerners, who could potentially either steal a win or hold out for extra time and/ or penalties.
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"These are the finals I like, because you are not the favourite, you are playing against another big team, you don't have more responsibility on your shoulder".
On Monday though, they were facing Manchester United who, unlike Nottingham Forest at the time, are one of the biggest clubs in the world. The reality is we want more.
If the striker doubts whether Mourinho would have the gumption to deprive him of a chance to lead United out at Wembley, he should cast his gaze in the direction of Luke Shaw.
Wayne Rooney is another potential candidate to start too, given that he's turned down the opportunity to sign for a Chinese club and fight for his place at United.
"First of all, I feel that the man [Claude Puel] that left the table a couple of minutess ago has a reason to be really sad and really disappointed, because he did fantastic work, his team did fantastic work".
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Committee members said they expect to continue reinvesting until normalization of short-term interest rates is well under way. But some also perceived risks of slower growth from some of Trump's proposals, presumably restrictions on trade.