Newly-crowned Bundesliga champions Bayer Leverkusen reached the Europa League semifinals but almost lost their season-long unbeaten record as they drew 1-1 away at West Ham United for a 3-1 aggregate victory on Thursday.

Xavi Alonso's side trailed to Michail Antonios early header and was far below their usual high standards in the first half as the hosts carved out several more chances.

Leverkusen, who clinched their first German title at the weekend, improved dramatically after the break and squandered numerous opportunities before substitute Jeremie Frimpong's shot deflected past Lukasz Fabianski in the 89th minute.

Despite being below their best, Leverkusen extended their unbeaten run in all competitions to 44 games and they are still on course for a treble. (SuperSport)