The trio missed Saturday’s goalless draw at Everton due to respective injury issues, none of which are thought to be serious.
Klopp will further assess his squad when they convene for training at Melwood on Monday evening, but he is confident of having more options at his disposal for the second leg of the quarter-final encounter at the Etihad.
Asked for an update on the Reds’ current fitness concerns, Klopp told Liverpoolfc.com: “No real clue in the moment because we have to wait a little bit. You can imagine, in this short period between games, it is quite difficult so I have to wait each minute I can and that’s what I’ll do. There’s nothing new in the moment, we will see.
“We will see in five hours until we train and we’ll know who is involved in that. I don’t know in the moment 100 per cent, but I am quite hopeful we will have a bigger squad than we had at Everton.”
He added: “The guys who were on the bench at Everton – Ox, Bobby and Trent from the first-team squad – for them, it was good not to play too long. They are fine, they were fine when I left Melwood yesterday.
“With Mo, Robbo and Alberto, we have to wait a little bit but of course [we have] big hope they will be back.
“Ben Woodburn is back after a long period and trained yesterday completely normal, which is really good for us.”