many chances as the rest of the team put together - and when Wayne Rooney and van Persie come back they will be a formidable trio. And as he is well used to English football, there's every reason to expect an instant impact from him. But this isn't just about Mata's individual gifts - it's also about the lift he will give the team. His arrival will immediately give the dressing room a boost.
Jason Burt, Sunday Telegraph football correspondent, BT Sport
He would walk into any team in the Premier League. If he were English he would be in Roy Hodgson's first picks. Maybe even THE first pick. Where will Mata play for United? It is almost immaterial. He is a world-class talent and, as was remarked earlier, Valencia did not struggle to find a way to accommodate Mata, David Silva and David Villa in the same side. He is mature and accommodating and will fit right into the dressing room.
Guillem Balague, journalist, Bleacher Report
The acquisition of Mata is a no-brainer, because players of his calibre don't come up that often. For Mata, it will mean a chance to return to the Premier League stage that has missed him so much.
Martin Samuel, journalist, Daily Mail
Whatever Mata achieves in a red shirt this season, he is the poster boy for optimism. Creative players with his gift are rare. With Januzaj on one side, Mata on the other Rooney and van Persie fit again, a far more substantial team begins to take shape.
David May, former United centre-back, Twitter
Great player, not quite sure where he will play but he's the quality that