Elliott has linked up with Barry Lewtas' U19s for their last-16 encounter away at Benfica on Tuesday afternoon.
But the Reds boss did reveal Neco Williams and Ki-Jana Hoever – who both appeared in the previous round of the FA Cup against Shrewsbury Town – are involved in the first team's preparations for the trip to Stamford Bridge.
Speaking at a press conference on Monday, Klopp said: "Harvey went with the U19s, the others not. How I said, we have a big squad and we can make decisions and we will make decisions.
"It's about who is ready for this game, how we can line up a team which we really think having fresh legs can fight really against this team, can defend Chelsea like they have to be defended and all these kind of things. That's what the line-up is about.
"We had a decision with Harvey and we had to make it a bit earlier because he had a little problem with his back on Friday, but it is good again and that's why he can play there."