Klopp explained: "I'm not 100 per cent sure.
"Both of them are much better but will they be OK for tomorrow night? I'm not sure in this moment so we will have to see.
"We have another [training] session at five and we will see who will be involved then. In this moment I am hopeful both will be involved in the session. That would then give us at least an opportunity.
"If they do not train it does not mean, especially in Dejan's case, immediately that he cannot play because it will be three days [since he last played]. If he could train tomorrow morning that would be enough.
"I don't know exactly. We had a few things after the game. Roberto [Firmino] had a little bit of cramp, Joe [Gomez] felt a little bit, so we were really careful the last few days.
"Tonight and especially tomorrow will be the first time I really think of the line-up and know 100 per cent who is available."