The 25-year-old sustained a thigh muscle injury in the 1.0 win at Hertha Berlin on Saturday.
The Germany international underwent test on Sunday morning after picking up the injury against Hertha Berlin.
“His absence is very bad news for us,” said Leverkusen sports director Rudi Voller.
“This is the game of games for us in the Champions League so we have to put everything we have in it even without Sam.”
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.