Nigerian international Victor Moses and Danny Drinkwater face uncertain futures at Chelsea after being left out of their Champions League squad again.
The duo are two of five members of Frank Lampard's first-team squad not selected along with Abdul Baba Rahman, fourth-choice goalkeeper Nathan Baxter and Charly Musonda.
Drinkwater and Moses were both out on loan at the beginning of the 2019-20 season but are yet to secure moves away from Stamford Bridge this time, with only the EFL and a limited number of other foreign leagues available for transfers.
Last season, Moses spent time on loan at Fenerbahce and Inter Milan, who had been interested in re-signing him before Monday's transfer deadline, but a deal did not materialise.
All of Chelsea's new summer signings are named in the squad for Group E, in which the Blues will play Sevilla, Rennes and Krasnodar. Youngsters Mason Mount, Callum Hudson-Odoi, Billy Gilmour and Reece James qualify for the B list.
Chelsea's opening fixture is against Sevilla in west London on Tuesday October 20.
Full squad: Kepa Arrizabalaga, Antonio Rudiger, Marcos Alonso, Andreas Christensen (HG), Jorginho, Thiago Silva, N'Golo Kante, Tammy Abraham (HG), Christian Pulisic, Timo Werner, Willy Caballero, Fikayo Tomori (HG), Kurt Zouma, Edouard Mendy, Mateo Kovacic, Olivier Giroud, Ben Chilwell (HG), Hakim Ziyech, Cesar Azpilicueta, Kai Havertz, Emerson Palmieri