Mikel Arteta says he doesn't know if Bukayo Saka will travel on international duty, with the England youngster facing another fitness test ahead of Sunday's match against West Ham.
The England international was taken off at half-time in the north London Derby win and replaced by Nicolas Pepe as a result of a hamstring problem.
However, Saka didn't train this week and Arteta confirmed that he will require a fitness test before the match against David Moyes' side.
"We don't know [if he will go on international duty] it depends how he feels in the next few days," he said.
"We spoke yesterday, he wasn't ready to be involved today.
"We will make the decision for Sunday against West Ham and then we'll talk with the doctors and national team to decide what we'll do."
Arsenal were also without Willian for their game against Olympiacos after he missed out with a tight calf muscle.
It means that Nicolas Pepe could start against West Ham on Sunday, or Gabriel Martinelli who made a late cameo appearance in the 1-0 defeat at Emirates Stadium.
