Schalke, who won their opening Champions League group game last week against Steaua Bucharest, are eager to bounce back from a 4-0 demolition by Bayern Munich on Saturday with a win in their one-leg tie against the third-division club.
"Draxler and Boateng will not be included in the squad due to injuries," Keller told reporters after the pair complained about minor knee injuries and were forced to skip training on Tuesday.
Keller could also be without striker Adam Szalai, who has influenza. Top Schalke striker Klaas-Jan Huntelaar is still out injured.
"There is still a question mark about Szalai but we all hope he can make it for tomorrow," Keller told reporters.
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- Bayern Munich
- Adam Szalai