Manchester United seriously have their chances threatened at the moment with the injury currently to Joshua Zirkzee who was doing very well for them and was an option for the coach to add life to the attack when needed. He was finding his place in the team already, becoming a big player for them in important games with his movement, dribbles and touches. Manchester United find himself in an unfortunate position and will miss him the remaining part of the season in the Premier League and also in this European competition.
Zirkzee's injury must be a shame for Amorim, however, he is one of the options for United's current attack line. Not much while Højlund I also think can't perform optimally.
With United's current situation, there is not much that Amorim can prepare. Their first leg could be tight, but the second leg will currently determine the fate of this team.
Although the match is predicted to be tight, United still has a chance by playing at home. They have to show their ability in the decisive match. Hopefully, some of their players perform extraordinarily and give miracles to all teams.