Arsenal will be without Brazilian winger Gabriel Martinelli as they make their return to the Champions League after a six-year absence against PSV Eindhoven on Wednesday.
Martinelli picked up a hamstring injury in Sunday's 1-0 win against Everton at Goodison Park.
Arsenal manager Mikel Arteta said the winger would definitely miss the Group B opener at the Emirates Stadium but that there was a "possibility" he could be back for next weekend's north London derby.
Leandro Trossard, who came on for Martinelli on Sunday and scored the winner against Everton to maintain Arsenal's unbeaten start to the season, is likely to take the Brazilian's place against Eindhoven.
The Gunners will be going up against familiar foes on Wednesday night as the clubs met in last season's Europa League group stages, with both claiming victories in their respective home fixtures.
On the Gunners' return to European football's top table, Arteta said: "We are proud and excited. It has been a long time for the club since we have been in the competition, and for me it is the first time as a manager, so I am really looking forward to it.
"We have been chasing it and fighting for it. Now we have got it and we have to make the most out of it.
"Every time I watched it and we weren't there, I felt it. This club has to be in the Champions League. It was a process but we are here and now we have to make the most out of it.
"It is always a learning process. I think we did and we have improved as a team, we have improved the squad and we deserve to be here.
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Everton player ratings. Jordan Pickford - 7: Had a decent game with his feet, two sharp saves from Odegaard and could do little about Trossard's goal. Reuters -
Ashley Young - 5: Tough afternoon for the veteran. Booked for chopping down Trossard and eventually withdrawn. Reuters -
James Tarkowski - 6: Important recovery challenge as Nketiah ran clear. Headed, blocked and cleared everything he could. Too many aimless lumps upfield, though. PA -
Jarrad Branthwaite - 7: Everton's best player. The young centre-back has lots of potential and had a promising game in difficult circumstances. Read play well, defended calmly and more measured than his colleagues with the ball. PA -
Vitaliy Mykolenko - 6: Handed the unenviable task of a one-on-one battle with Bukayo Saka who, for the most part, he handled quite well. EPA -
Amadou Onana - 5: Everton have issues in midfield with the balance being wrong. Onana struggled, giving the ball away over and again. AP -
Idrissa Gueye - 5: Made a strong start to the game but seemed to become more erratic as it went on. Shot wildly during one of Everton's rare forays up the pitch. EPA -
Abdoulaye Doucoure - 5: Plenty of effort but precious little quality from the most advanced of the Everton midfield three. EPA -
Arnaut Danjuma - 5: With Everton having so little of the ball it was hard to get him in the game. Worked hard off the ball but was a peripheral figure. Reuters -
Dwight McNeil - 5: Struggled badly on his first start since recovering from injury. Was one of Everton's best players down the stretch last season and will get better from here. EPA -
Beto - 6: Worked his socks off but was often far too isolated to have any real impact on the game. EPA -
Everton substitutes: Dominic Calvert-Lewin (Beto, 65') - 6: A couple of bright bits of play after coming on in a protective face mask. Reuters -
James Garner (Doucoure, 80') - N/A: No real time to influence the game. Surely overdue a start in his favoured midfield role. Reuters -
Youssef Chermiti (McNeil, 87') - N/A: No time to make a difference. Nathan Patterson (Young, 87') - N/A. -
Arsenal player ratings. David Raya - 6: Somewhat surprisingly picked ahead of Ramsdale for his first Gunners' league start. Won't have much easier days thanks to Everton's shot-shy attack. AFP -
Ben White - 7. Had a decent game on the right of Arsenal's defence. Joined in effectively down the flank as they went forward. EPA -
William Saliba - 7. Coped well with Beto and was calm, assured and in control all game. Although should take a mark off for his play acting on the stroke of half-time. AFP -
Gabriel Magalhaes - 6. Another guilty of play acting, but overall a solid display from the Brazilian defender. AFP -
Oleksandr Zinchenko - 8: Spent most of the game in midfield looking for the pass to open Everton up. Almost managed it a few times before his crucial role in the decisive goal. Getty -
Declan Rice - 7: Composed and reliable at the base of Arsenal's midfield. Offered a solid platform for those in front of him. AFP -
Martin Odegaard - 7: Drew two good saves from Pickford. Another who had a key role in the decisive goal. AP -
Fabio Vieira - 7: Impressive display from the Portuguese. Was a threat from the left and, along with Zinchenko, looked most likely to unpick the packed home defence. Reuters -
Bukayo Saka - 6: Struggled to make an impact with Mykolenko all over him like a rash. Broke free to deliver the cut back for Trossard. PA -
Eddie Nketiah - 5: Offered little up front and was offside in the build-up to Martinelli's disallowed goal. AFP -
Gabriel Martinelli - 6: Finished in style for the goal that did not count before injury curtailed his afternoon. Getty -
Arsenal substitutes. Leandro Trossard (Martinelli, 24') - 7: Looked bright and inventive after replacing Martinelli early in the game. Fabulous finish for the goal. AFP -
Gabriel Jesus (Nketiah, 66') - 6. Offered more than Nketiah and gave some back to Everton's physical defenders. AFP -
Kai Havertz (Vieira, 80') - N/A: No real time to make an impact. Getty -
Takehiro Tomiyasu (Zinchenko, 80') - N/A: Helped Arsenal get over the line. Reuters
"It starts at home. I'm sure our supporters will be really excited and we have to enjoy the challenge."
PSV have made a perfect start in the Eredivisie, winning all four of their matches – scoring 13 goals and conceding just one.
On the challenge posed by PSV, Arteta said: "We have to treat it like any other game. We are used to playing tough opposition every week in the Premier League. It will not be any different tomorrow."
Arteta refused to be drawn when asked about the goalkeeping situation, after he replaced Aaron Ramsdale with David Raya for the game against Everton.
"I respect opinions and I understand the questions and historically what has happened," he said. "We have been doing this for many years. It is my job to answer the questions in the best possible way and to do what I feel is best for the team and the club.
"Tomorrow we are going to play against a really good team. They are used to winning and it will be a really tough test, I am sure about that."
