The 21-man senior squad that Klopp will have at his disposal for the six group games has been named, as the Reds prepare for life outside of the Champions League for the first time since 2016.
The deadline for clubs to provide their squad list to UEFA was Monday evening, with a maximum of 25 players permitted to be on the A list of players.
A minimum of eight of those spots must be allocated to locally trained players and a maximum of four can be association trained.
Teams can also register an unlimited number of players on their B list, which comprises of players born on or after January 1, 2002 who have spent at least two years at their respective clubs.
Those restrictions left Klopp with a tough decision to make as he was required to cut one player from his selection following the signing of Ryan Gravenberch.
His decision has been revealed to omit Adrian, though as reported by This Is Anfields David Lynch, a UEFA loophole could still see him feature in the event of long-term injury to Alisson or Caoimhin Kelleher.
Vitezslav Jaros and Bobby Clark have both been listed on the squad page but the understanding is they will form part of Liverpools B list.
Otherwise, there are no surprises in Liverpools squad to play in the double-headers with LASK, Union SG and Toulouse.
The Reds were drawn in Group E in this seasons competition and will get their campaign underway with a meeting away at LASK on September 21.
Klopp will be hoping to take his side to a fifth European final in Dublin, having reached the showpiece in Basel when the side last played in the competition.
Goalkeepers: Alisson, Kelleher
Defenders: Van Dijk, Konate, Gomez, Matip, Alexander-Arnold, Robertson, Tsimikas
Midfielders: Szoboszlai, Mac Allister, Thiago, Gravenberch, Jones, Endo
Forwards: Salah, Diaz, Gakpo, Nunez, Jota, Doak
To be named on List B: Pitaluga, Jaros, Quansah, Bradley, Bajcetic, Elliott, Clark