Arsenal will be without Sead Kolasinac for Thursday's Europa League round of 32 second-leg clash at home to Olympiakos.
The Gunners hold a 1-0 lead from the first leg but will be without the left-back after he suffered a serious shoulder injury in the weekend win over Everton .
Cedric Soares (knee) and Kieran Tierney (shoulder) are back in training but not expected to feature, while Calum Chambers (knee) remains sidelined and faces a race to be fit for the start of next season.
And speaking about Kolasinac's injury in his pre-match press conference on Wednesday afternoon, Gunners boss Mikel Arteta admitted the defender could be out for some time.
He said: “He’s seen a specialist today. We are not very positive about it. We will know more this afternoon.”
Arteta, meanwhile, is hoping his team can follow up on their first-leg performance and book their spot in the last-16 at the expense of their Greek opponents.
The Spaniard added: “I was very pleased with the general performance apart from the first 10 minutes when we gave the ball away.
“The team played with a lot of personality and we managed to score which is positive.
“The team is progressing well, the club is looking in a better place, we are getting unity. There’s a lot of positives but still a lot to improve.”
Arteta was joined in his press conference by Alexandre Lacazette, who believes Pierre-Emerick Aubameyang deserves more credit for his goalscoring exploits.
Aubameyang's brace in the 3-2 win over Everton took his goal tally for the season to 17, level at the top of the Premier League scoring charts with Leicester's Jamie Vardy.
Lacazette said: “People should talk more about Auba. He’s not just a goalscorer. If we start winning trophies people will start talking about him (like that).”
Provisional Arsenal squad: Leno, Martinez, Bellerin, Papastathopoulos, Luiz, Mustafi, Mari, Holding, Maitland-Niles, Saka, Guendouzi, Torreira, Xhaka, Willock, Ceballos, Ozil, Pepe, Nelson, Lacazette, Martinelli, Nketiah, Aubameyang.
