We want Manchester United to not lose in the first leg at San Mames so that later in the second leg at Old Trafford they can target a positive result.
A draw in the first leg will be very beneficial for Manchester United to hope for more in the second leg. In terms of performance, Bilbao is better if you look at La Liga while Manchester United is bad in the English Premier League. While in the Europa League, Manchester United have never lost that I know of.
Manchester United's good record throughout the Europa League gives us confidence that Manchester United can play in the final, but I don't dare to guarantee it. If Manchester United can make it to the final and the opponent is Tottenham, I will bet on Manchester United.
So far Man United in the European league is very good and it is not wrong if Man United has never lost in the European league. This is what makes many people think that Man United's hopes of winning the European title are there even though they are very inconsistent in the domestic league but very different when playing in the European league. Bilbao is indeed not an easy opponent, but if in the first leg Man United can hold a draw that is good enough because Man United has a greater chance in the second leg.
However, interestingly the remaining teams in the Europa League semifinals this season all have their own motivations to win the Europa League. For Tottenham, this is their only chance to save this season as well as Man United, this is their only chance to save this season and be able to play in the champions league next season. For Bodø of course he wants to make a surprise and make history as an underdog team to win the Europa League trophy and for Athletic they want to win the trophy at home.. lol. Because the Europa League final is held at the San Mames stadium.