The Hammers face a tough assignment in the Europa League quarter finals, as they take on the Bundesliga leaders.
Leverkusen, who are within touching distance of the league title, have not lost in 41 matches so far this term.
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We have to believe," said the goalkeeper ahead of the game on Thursday.
We know it's a huge challenge in front of us, but the games in Europe are always very special.
Every game is different, every European team is different from our experience over the last three years. Hopefully, it will be a good night for us."