Liverpool is the top team at the moment in Premier League so they are supposed to be the favorite for the Europa Trophy but there's also the Bundesliga Nummer Eins, Leverkusen who might be the only one competitive team for Liverpool. I don't see any other options and hope the two are not drawn to play before the finals.
Even though Leverkusen saved the humiliating defeat against Qarabag in the first leg with an equalizer on the injury, they still are a capable team. Playing on an entirely new field could sometimes be overwhelming and they'll cover of the lack of advantage on their home game.
AC Milan and AS Roma could be other candidates who have a chance to stop Leverkusen or Liverpool from reaching the final. AS Roma is now also a team that has experienced significant improvement after being managed by Daniel De Rossi, these two teams deserve to be considered a tough test for anyone who has the ambition to win the Europa League trophy this season. Liverpool deserves to be considered the strongest candidate among all the contestants, because it comes from the Premier League which is known as the most competitive league. Leverkusen is the most ideal team to be their opponent in the final match this season, because he has never been defeated.