What's the cut off for that?
Gomez is 21 now and not on the list.
He's still listed as an U21 player.
Edit: (From Premier League)
Under-21 players are eligible over and above the limit of 25 players per squad.
For the 2018/19 campaign Under-21 players will have been born on or after 1 January 1997.
Liverpool
25 Squad players (*Home grown)
Barbosa De Oliveira, Roberto Firmino
Becker, Alisson Ramses
Clyne, Nathaniel Edwin*
Henderson, Jordan Brian*
Henrique Taveres, Fabio
Karius, Loris Sven
Keita, Naby
Lallana, Adam David*
Lovren, Dejan
Mane, Sadio
Matip, Job Joel Andre
Mignolet, Simon
Milner, James Philip*
Moreno Perez, Alberto
Origi, Divock Okoth
Oxlade-Chamberlain, Alexander Mark David*
Randall, Connor Steven*
Robertson, Andrew
Salah, Mohamed
Shaqiri, Xherdan
Sturridge, Daniel*
Van Dijk, Virgil
Wijnaldum, Georginio
U21 players (Contract and Scholars)
Adekanye, Omobolaji Habeeb
Alexander Arnold, TrentAtherton, Daniel
Awoniyi, Taiwo
Bearne, Jack William Garrad
Beck, Owen Michael
Boyes, Morgan
Brewster, Rhian
Brookwell, Niall
Cain, Jake Steven
Camacho, Rafael Euclides Soares
Chirivella Burgos, Pedro
Christie-Davies, Isaac David
Clarkson, Leighton
Clayton, Thomas
Cordoba, Anderson Arroyo
Coyle, Liam
Dixon-Bonner, Elijah Malik
Duncan, Bobby
Ejaria, Oviemuno
Gallacher, Tony
Garcia Rey, Juan Manuel
George, Shamal
Glatzel, Paul
Gomez, Joseph DavidGrabara, Kamil
Jaros, Viteslav
Johnston, George
Jones, Curtis
Kane, Herbie
Kelleher, Caoimhin
Larouci, Yasser
Lewis, Adam
Longstaff, Luis James
Masterson, Conor
McAuley, Glen
Millar, Liam
Ojo, Oluwaseyi
O'Rourke, Fidel
Phillips, Nathaniel Harry
Raitanen, Patrik
Ritaccio, Matteo
Rodrigues De Souza, Allan
Savage, Remmi Eugene
Sharif, Abdulrahman Mohamoud
Solanke-Mitchell, Dominic AyodeleTagseth, Edvard Sandvik
Turner, Alex
Varesanovic, Dal
Virtue Thick, Matthew Joseph
Walls, Jack
Whelan, Corey
Williams, Ben
Williams, Neco Shay
Williams, Rhys
Wilson, Harry
Woodburn, Benjamin