Arsenal midfielder Lucas Torreira has travelled with the squad for Thursday's Europa League quarter-final second leg at Napoli.
The Uruguay international came off at half-time in Monday's Premier League win over Watford with a tight groin but is in contention to start in the San Paolo Stadium.
Loanee Denis Suarez (groin) has stayed behind in London while long-term absentees Danny Welbeck (ankle), Rob Holding and Hector Bellerin (both knee) are still missing.
Despite leading 2-0, Arsenal boss Unai Emery will send his side out to win in Naples.
"We know 90 minutes here can be long, but we want to play this match not thinking about the first leg," he said.
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"We want to play tomorrow thinking to win, thinking to score, thinking to push, thinking to stop them.
"Thinking also tactically to be together and thinking when we have the space to attack the space. And also respecting the tactical structure and individual work.
"They have a lot of players with a big quality to push against us and give us a lot of problems but we also have the players to fight against them with our quality."
Provisional squad: Leno, Cech, Maitland-Niles, Lichtsteiner, Jenkinson, Mustafi, Koscielny, Monreal, Kolasinac, Xhaka, Guendouzi, Torreira, Elneny, Iwobi, Mkhitaryan, Ramsey, Ozil, Aubameyang, Lacazette, Nketiah.
