Arsenals Max Dowman, Liverpools Federico Chiesa and Tottenhams Mathys Tel
European club football returns after the international break and Premier League teams have named their squads.
Fifteen-year-old Max Dowman is in line to become the youngest player to appear in the Champions League after being selected in Arsenals squad, but Federico Chiesa has been omitted from Liverpools.
Nottingham Forests record signing Omari Hutchinson is one of five summer arrivals not to make their Europa League squad.
Liverpool forward Chiesa is the highest profile absentee from Arne Slots 22-man squad., external
Clubs can name up to 25 players, with a maximum of 17 who were not "locally trained".
Seventeen-year-old forward Rio Ngumoha, who scored a dramatic winner at Newcastle last month, has been selected.
New signings Florian Wirtz, Alexander Isak, Hugo Ekitike, Jeremie Frimpong, Milos Kerkez, Giovanni Leoni, Giorgi Mamardashvili and Freddie Woodman are in the squad for the six-time European Cup winners.
Midfielder Dowman, 15, has been named in Arsenals 23-man squad,, external but there is no place for injured striker Gabriel Jesus.
Should Dowman, who was born on 31 December 2009 and made his Premier League aged 15 years and 234 days last month, play before his 16th birthday he will become the youngest player to appear in the Champions League.
The record is held by striker Youssoufa Moukoko, who was 16 years and 18 days old when he played for Borussia Dortmund in 2020.
Winger Ethan Nwaneri and defender Myles Lewis-Skelly are missing, but they can be named on squad list B - made up of players who are under 21 and have been eligible for the first team for at least two years.
Jesus is recovering from a knee injury sustained in January.
Arsenals eight senior summer signings have been named, including Martin Zubimendi, Eberechi Eze and Viktor Gyokeres.
Chelsea manager Enzo Maresca has left new striker Facundo Buonanotte out of his 23-man squad., external
The Argentina international, who joined on a season-long loan from Brighton, spoke of the "opportunity to play in the Champions League for the first time" in his first interview with the club.
Tottenham manager Thomas Frank has omitted £30m signing Mathys Tel from his squad., external
Other summer signings, including Randal Kolo Muani and Xavi Simons, have been named, but Kota Takai, Yves Bissouma and the injured James Maddison, Dejan Kulusevski and Radu Dragusin miss out.
Newcastle United brought in forwards Nick Woltemade and Yoane Wissa to replace striker Alexander Isak, who moved to Liverpool, and both are in Eddie Howes squad., external
Newcastle have also included summer signings Aaron Ramsdale, Antony Elanga, Jacob Ramsey and Malick Thiaw.
Italys Gianluigi Donnarumma, who helped Paris St-Germain win the Champions League last season, is one of four goalkeepers in Manchester Citys squad, external after joining on transfer deadline day.
France midfielder and summer signing Rayan Cherki has been picked by Pep Guardiola despite being expected to be sidelined for two months with injury.
New arrivals Rayan Ait-Nouri, Marcus Bettinelli, Tijjani Reijnders and James Trafford are also in.
Nottingham Forest manager Nuno Espirito Santo has left Hutchinson out of his 22-man squad, external for the Europa League.
The winger, who joined Forest for £37.5m from Ipswich, has been omitted along with four other new arrivals - keeper Angus Gunn and defenders Oleksandr Zinchenko, Jair Cunha and Cuiabano.
Forwards Jota Silva and Taiwo Awoniyi, who have been linked with moves away from the City Ground, have not been named.
The major omission from Aston Villas 21-man squad, external is midfielder Ross Barkley.
Argentina keeper Emiliano Martinez features after failing to secure a move away from Villa Park before the transfer deadline.
New signings Victor Lindelof, Harvey Elliott and Jadon Sancho have been selected.
Crystal Palace have named captain Marc Guehi in their Conference League squad, external after a deadline-day move to Liverpool collapsed.
Each club competing in a Uefa competition must submit two lists of players.
On list A, clubs can submit a maximum of 25 players, with eight places reserved exclusively for homegrown players.
These eight must be made up of at least four "club-trained" players and a maximum of four "association-trained" players.
According to Uefa regulations, players who meet the club-trained criteria must have been on the clubs books - irrespective of nationality and age - for at least three years between the ages of 15 and 21.
An association-trained player is someone who has played in the same country as the club they are currently at for three years, irrespective of their nationality, between the ages of 15 to 21.
On list B, a club can register an unlimited number of players for the season as long as they were born on or after 1 January 2004.
The list A squads for the 36 Champions League league phase contenders were submitted on Wednesday, while list B players must be submitted no later than 23:00 BST the day before each match.
Uefa also states that a player who has featured during any of the qualifying rounds before the group stage of the Champions League, Europa League or Conference League can play in those competitions for another club from the league phase onwards.