MatchAtalanta v Liverpool: Europa League team news
Conor Bradley was not part of the 24-man squad that flew out to Bergamo looking to overturn the Reds' 3-0 first-leg deficit, due to injury.
The 20-year-old was forced off with the issue early in the second half of the Premier League defeat by Crystal Palace at Anfield last weekend and is set to be sidelined for around two weeks.
Offering an update at his pre-match press conference on Wednesday, Jürgen Klopp said: "I think Ryan Gravenberch had a similar thing, so first week of May he [Bradley] should be back in training. When is that? Two weeks' time.
"[He] overstretched the ligaments, not serious-serious but serious enough that he's not here."
Klopp reported he had no fresh injury concerns within his squad, though he remains without Thiago Alcantara, Ben Doak and Joel Matip.
Stefan Bajcetic took part in the Reds' preparations for the second leg but has not travelled, with his return from long-term injury being closely managed.
For Atalanta, defender Sead Kolasinac missed the Anfield first leg through injury but made a comeback in their 2-2 draw with Verona in Serie A on Monday night.
It means Giorgio Scalvini is set to be the only absentee for Gian Piero Gasperini's side.
Previewing the game, Gasperini told reporters: "It would be a mistake to think about the 3-0 in the first leg. We have to play as if we are starting at 0-0.
"Liverpool are a great team regardless of their recent defeats. There is a lot of balance and everyone always gives their all. They remain a team of great value, one of the strongest in the world."
Last match
Atalanta 2-2 Verona (April 15): Carnesecchi, Toloi, Hien, Djimsiti, Holm, Ederson, Pasalic, Ruggeri, Koopmeiners, De Ketelaere, Scamacca.
Liverpool 0-1 Crystal Palace (April 14): Alisson, Bradley, Konate, Van Dijk, Robertson, Mac Allister, Endo, Jones, Salah, Diaz, Nunez.
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