De Gea's next challenge is the artificial pitch which will confront United at the Stade de Suisse when they face Young Boys on Wednesday night.
De Gea - coveted by Real Madrid until they signed Thibaut Courtois from Chelsea - gave a non-commital answer when asked about whether he will pledge his long-term future to the club.
"I never listen to stupid things they say". "I'm really happy. It's one of the best clubs in the world so it's really good to be part of this club".
"Well, normally I never listen to the people who speak about me", he said. "I'm focused on my job and trying to help my team, trying to improve every session and trying to be as good as I can". He is of the same mind as José Mourinho that the surface will make the match more hard.
"We are not used to playing on artificial grass so it's going to be a bit different and probably more hard for us", he said. We know it's a special competition. "If he doesn't tell me he wants to leave it's because he wants to stay - that's my conclusion".
"I try to look at as many games as I can from the season before, the mistakes I have done and the points I can improve on", Lukaku was quoted as saying by the BBC. "He has a favourite surface but he has to win on the surfaces he is not in love with".
"We want to start well, winning games and of course try to win this competition but we know it's always hard to win".
Mourinho confirmed that Marcus Rashford, serving a three-match domestic ban, would start, while Diogo Dalot, a summer signing from Porto, could also be in the lineup.
'We are ready to do it, we have a hard group.
"We will be travelling over a little earlier to make sure we train on that pitch so we can get used to it, but on the back of two away wins [against Burnley and Watford] I think we can build that momentum at a crucial time of the month where there are so many games".
The Jose Mourinho tutored-side are now enjoying a new lease of life, after making it two consecutive wins at Vicarage Road, as well as beating Burnley before the first worldwide break of the season.