On several occasions, Xavi said that Barcelona is serious about targeting this competition trophy. even one of their strikers, Lewandowski, once said that he and his colleagues had the ambition to win the Europa League trophy. so it's clear that Xavi really cares about this competition trophy besides prioritizing winning the La Liga trophy.
Barcelona and the other teams look financially to these competitions, as long as the financial prizes are much less than the ECL or La Liga prizes, I think they will focus on La Liga more than this one, and if they somehow managed to win it, that would be good for the name of Barcelona and could give Xavi and the other young players more confidence. On the other hand, the same thing applies to Manchester United, as they won't be interested a lot in winning this competition on the back of their rank in the EPL.
Basically every title will have a good impact on the players and also for the team, at least it's not just about money, money and money to make them have no interest in winning the title. After all, if they think about money then they can become greedy with the ambition to get all the titles in the tournaments they play.
What's more, the opponent he is facing is Manchester United, so this will increase Barcelona's prestige.
Therefore, I'm sure Barcelona will continue to play according to their abilities, so even if for example Barcelona loses I'm sure it's not about money or a small prize, but because Manchester United at this moment is also having a good performance.