The pair were recently sidelined after testing positive for COVID-19, but could now come into contention for Liverpool's Carabao Cup semi-final, first leg with Arsenal on Thursday.
However, Thiago Alcantara and Divock Origi will miss the Anfield tie as they remain ruled out through injury.
Speaking at his pre-match press conference on Wednesday, Klopp said: "Trent and Ali trained yesterday. Div and Thiago not. That’s it pretty much.
“Like always in these times, all players, apart from the injured ones or in Africa playing [the] Africa Cup of Nations, who test negative should be available.
“Harvey Elliott looks really promising, out on the pitch – didn't train with the team yet but I don’t think we are too far away from team training. What he's doing in the moment looks really good.
“Robbo got a little knock in the Shrewsbury game but is fine. I'm not sure if I forgot anybody but the rest are available.”