Injury problems are still an issue for the Parkhead boss before the meeting with the German guests in the second round of the group stage.
Another defeat would pose a really difficult task for Postecoglou and his team, either Leverkusen or Real Betis, who defeated the Hoops in Seville a few weeks ago, have won three of their last four league games.
Unfortunately, there are a number of players the Aussie cannot draw on, including summer signings Kyogo Furuhashi, Josip Juranovic and Giorgos Giakoumakis, with the latter still to make his debut after his move from VVV-Venlo.
Captain Callum McGregor remains a significant doubt for the game despite his boss refusing to exclude him from the competition.
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