Should Xabi Alonso's Bayer Leverkusen keep pursuit of a remarkable treble, the Bundesliga leaders will need to get past a dogged West Ham buoyed by recent European successes. Leverkusen host the Hammers in the first leg of their Europa League quarter-final on Thursday and are yet to lose this season, winning 36 and drawing five of their 41 games. The Bundesliga champions-elect are 16 points clear of second-placed Bayern Munich in Germany and could lift their first-ever league title as early as Sunday with a win over Werder Bremen.