Manchester United proved they are capable of winning the Europa League title with a win over Barcelona. And to defeat any team. My prediction is that a Premier League team will win the Europa League title this season. Either Manchester United or Arsenal will win the Europa League title. The performance of Roma or Juventus is erratic. And so their chances of winning the title are less.
The last season may be proven if frankfurt as a team that was kicking barcelona out of europa league has also become a winner for europa league. It seems like most of people have faith in MU right now. I think that this gonna be a hard thing to predict. This is football where we will not know the result if the match has not started yet. MU may potential to win the trophy but there are many strong clubs in europa league too.
People were always seeing the performance in the domestic league as a measurement to determine how good the team while so many times if performance in the domestic league didn't determine the result in competition like this.