Diogo Jota, Alisson, Stefan Bajcetic and Trent Alexander-Arnold all returned to Liverpool team training on Tuesday.
Jurgen Klopp was asked if the four players are available for the Atalanta game on Thursday.
"We'll have to see that," he said, as quoted by the Liverpool Echo. "We didn't rush it with the boys.
"Diogo and Trent worked as a group for two or three weeks and could do proper training. They looked very good yesterday.
"Stefan is different a little bit because he was out for much longer. It might make sense to give him a game at U21. Alisson is on his way back as well. They are now back in training and now we'll see how we involve them.
"If they're ready to go then it's perfect timing with Thursday-Sunday."
Liverpool face Atalanta in the first leg of the Europa League quarter-final tie on Thursday, April 11 (KO 8pm UK time).
