Liverpool manager Jurgen Klopp says injured trio Trent Alexander-Arnold, Allison and Diogo Jota are back in training but there is "no decision" about whether they will face Atalanta.
The Reds host the Serie A club in the Europa League quarter-final first leg on Thursday.
Out since February, the three players returned to training on Tuesday.
"That we need them is clear, but we need them in the best possible shape and to give them rhythm," said Klopp.
"It's always a challenge to reintegrate them but they are quality players so they will manage it. We will see over the next days and weeks, but as for tomorrow there's no decision yet.