United's next game is a Champions League match against Juventus at Old Trafford and Young is optimistic about coming away with three points.
Ashley Young certainly has a point as Manchester United looked much more unsafe in the second half and were adequately rewarded in the form of two goals.
And Szczesny, who has flourished for Juventus since replacing Gianluigi Buffon as their No 1 goalkeeper, believes Cristiano Ronaldo will be going up against an "angry" United.
"We have shown that we can bounce back, that we still have faith and we are the Man United that everyone talks about", he told the club's official website.
"We have to go into the game looking to start on more of the front foot, especially at home".
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"I think we deserved to win it, especially when we got back into the game and we really did get on top, but this is what we have to do against Juventus".
"I'm personally very satisfied and previous year I got to learn a lot from Buffon, whilst also playing a lot of games".
"I think this gives us a lot of confidence for Tuesday and the manager gives us that confidence, too".
"It is disappointing, but we have to take the positives from the game and kick on from here".
"It'll be very different with Manchester United, as we will both be playing to win".
Despite almost a month on the sidelines, the 22-year-old was happy to be given a chance to impress Mourinho.