Celtic went into the interval 2-0 down thanks to goals from Hincapié and Diaby. The first goal was particularly poor with David Turnbull suffering from a horrible mistake in the Celtic box before Bakker cut the ball into the path of the forward, who made no mistake from close range.
It was a goal that really upset the Celtic rhythm. Before that, Kyogo had a couple of good chances and was denied by Tah & the Finnish goalkeeper.
A quick counter attack resulted in the centre halves being exposed and a cut back resulted in another goal for the visitors.
Adam Montgomery struggled against the pace of the Bayer Leverkusen right side, which included the former Celtic full back Jeremie Frimpong.
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