De Gea admits United will be at a disadvantage against Young Boys because of the artificial pitch at the Stade de Suisse.
I am really happy to play for this club, one of best clubs in world, so for me it's really good to be part of this club'.
"I am focused on my job and trying to help my team - try to improve every training session and try to be as good as I can, so I never listen to stupid things like this they say". And I repeat, Marouane [Fellaini] is really important for them in two hard matches, matches of two-against-two, because Burnley and Watford play two strikers, two powerful strikers. He is of the same mind as José Mourinho that the surface will make the match more hard.
"You want to be involved for a top club, you want to be involved for your country as well and it was a disappointment, but I had to turn it into a positive to a point where I have my rest and I have a full preseason which I have not had for a while".
"I think we did that, we can be proud of the second-half performance and it will probably give us a bit of momentum going into next week. If he doesn't tell me he wants to leave it's because he wants to stay - that's my conclusion".
"Getting two wins on the bounce and coming into a month where there are so many games, I think we are building momentum at the right time".
"We are in a hard group, starting tomorrow with a hard team".
Mourinho used the example of Roger Federer to illustrate the requisite mindset his players must adopt. "We have to do it".
"It's about getting four or five wins on the bounce, that's what the manager emphasised before the game and it's on us to start producing that run".
In Valencia's absence - the full-back's knee injury precludes him from playing on the artificial surface - Diogo Dalot, the 19-year-old signed from Porto in the summer, may make his United debut.
Mourinho said: "Very important".
The Red Devils are aiming to establish themselves as one of the main contenders for both the Premier League and Champions League this term after they ended up without a trophy under Mourinho last season.
'We are ready to do it, we have a hard group.
"But we have to train today (Tuesday) to see how the balls work on this pitch and try to play our football here".