However, only the Slovakian centre-back is likely to regain his place in the starting line-up as Gerrard has played just 27 minutes of football since February 10 because of injury and a three-match ban.
Striker Daniel Sturridge is a doubt with a hip problem but fellow forward Mario Balotelli trained this week after a three-match absence through illness and injury.
Jordon Ibe is cup-tied.
Provisional squad: Mignolet, Can, Skrtel, Lovren, Henderson, Allen, Lucas, Gerrard, Moreno, Coutinho, Markovic, Sterling, Jones, Toure, Johnson, Manquillo, Enrique, Brannagan, Balotelli, Borini, Lambert.
Liverpool vs. Aston Villa is on Sunday, 3pm BST kick off.