Of course Liverpool and Bayer Leverkusen are the main candidates for the title this season. But Milan can probably do well too, they played well in the qualifiers. I also like Sporting Lisbon, who also did well. I think this Europa League season could easily be a surprise. It could happen that for example Bayer and Liverpool meet before the final.
With the current level of performance and quality we can say Liverpool, Bayer Leverkusen and AC Milan are not strong candidates for the win but as we all know UEFA Europa League has never been easy to predict because we have history of surprises and shocking results, so any team can create surprise with teams which are capable of doing anything shocking are Sporting Benfica and West Ham even many will go against them because few are not doing good but still we are having good things in these teams and their experience and quality are good which are needed for the win in this event but for the better predictions about who is going to win we have to wait for the quarterfinals because then things will be better and teams which will be hot surely going to be at the top.