We are back in action tomorrow, nice! Leverkusen are still unbeaten and they would like to make it stay that way as well. Here in the first leg I don't give much chance for West Ham to catch them by surprise. Because now Leverkusen are inches away from announcing their Bundesliga title early. I expect them to be even more concentrated on the Europa League title from now on. 
I hope to not see the kind of performance they had against Qarabag this time in short. They can't beat West Ham that easy by playing inconsistently. West Ham aren't an easy team to beat as we are talking about a Premier League quality.
I think Leverkusen will win the first leg and maybe a finish with a draw in the rematch.
After we see a fantastic match in the Champions League of course we will enjoy the second biggest European competition later, Leverkusen vs Westham will be a match that is worth waiting for besides the Milan vs Roma match, but honestly I personally might enjoy the Milan and Roma match because we can indeed categorize it as a team of life and death for two teams from the same league, Leverkusen have the advantage because indeed they are no longer burdened with the domestic championship that they are now sure to get.I hope to not see the kind of performance they had against Qarabag this time in short. They can't beat West Ham that easy by playing inconsistently. West Ham aren't an easy team to beat as we are talking about a Premier League quality.
I think Leverkusen will win the first leg and maybe a finish with a draw in the rematch.We can say that at the moment Leverkusen's main focus is of course the European trophy to be able to complete their achievements this season, and facing West Ham who are down in the league maybe Leverkusen will be the favorite in the match later, but in my opinion Westham will give a surprise that may not be expected by Leverkusen because so far the small teams of the english League cannot be underestimated in the european League, like as you said, if Leverkusen play like against Qarabag then it is not impossible that Westham will be able to destroy Leverkusen later.