"I don't want to rule it out but I cannot really plan with it," Klopp told the club's website.
"He is not here for good reasons, because he cannot be part of training. We are back on Friday. Then from Saturday on, Dejan is back at Melwood and we will see."
First-choice centre back Joe Gomez is out of action having undergone surgery on a fractured leg, with no timescale put on his return.
With Virgil van Dijk suspended for the first leg encounter against the German champions, Klopp may consider slotting in Brazil midfielder Fabinho alongside Joel Matip at the heart of the defence.
"Of course, we have to prepare it differently. If Dejan gives a sign on Monday – 'I feel brilliant' – then we’d have to think anew," Klopp added.
"But in the moment we prepare the game and in this preparation Dejan is not involved. We have to find other solutions."
(Reporting by Hardik Vyas in Bengaluru; Editing by Christian Radnedge)
