Having a draw in their last match by Manchester united is still a good result, and shouldn't be used to judge their match with Barca. EPL is different and tougher than Laliga,which gives Manchester united more advantage over Barca. It will be a difficult and interesting match,since it has been long since this two clubs clashed.
What's interesting is that the two teams, both Manchester United and Barcelona, are both experiencing an increase in performance in their respective leagues so that their full strength will definitely be seen in the Europa League matches this season and every coach from the two teams will also be very aware of this. they are facing is not a weak team and clearly needs more improvement before the game starts.
Yes it's good news that before they actually met, they could do a good upgrade faced by a lot of people. Things like this will be the color of its own for the course of the match later. Unlike in the Champions League, which brought Real Madrid and Liverpool together, for example, Liverpool could not improve their performance, so that caused bad speculation about Liverpool at this time.
Manchester United and Barcelona rarely meet, the last time they met was in 2019 if I'm not mistaken, so this meeting will definitely be eagerly awaited.