Before every Arsenal fixture, we’ll bring you a Scouting Report on the Gunners’ next opponents.
Former Arsenal midfielder Stewart Robson will give his pre-match view and you can get his post-match verdict in our Talking Tactics feature on Arsenal Player.
Arsène Wenger and his travel to Greece to face Olympiacos on Tuesday so, to find out more, we also asked journalist Tasos Zachariades for his thoughts and analysis.
“Olympiacos played much better at the Emirates than I expected, having watched them lose at home to Marseille. Although Arsenal won the game 2-1, the Greek side outpassed Arsenal in midfield where Pablo Orbaiz and Ariel Ibagaza were outstanding.
"They also played with great energy in forward areas with Rafik Djebour and Kevin Mirallas the main threats. However, they lack pace at the back and Alex Oxlade-Chamberlain gave left back Jose Holebas a difficult first half."
TASOS ZACHARIADES, LONDON GREEK RADIO
"They have a reputation for being an attacking side, and essentially they are the top team in Greece. They have plenty of players who can hurt Arsenal, as we saw in the first game at the Emirates.
"Rafik Djebbour has been scoring plenty of goals along with the likes of Kevin Mirallas and Ariel Ibagaza who have looked dangerous all season. Arsène Wenger said Olympiacos should not be underestimated and I agree.
"They have plenty of international players, including players like Jean Makoun, who used to pay for Aston Villa for example.
"The manager spoke last night and said that Arsenal are a good team whoever they put out. The young players might play even better than the regular team because they have something to prove. It's not as though Olympiacos are looking forward to playing a younger team - they will not underestimate them at all.
"Olympiacos have looked a little weak in defence, but improved since. Even in the Greek Super League they have conceded goals against the other teams, sometimes twice in a game.
"You could see that they played an attacking game even in the game at Emirates Stadium. They have shown that they can attack and play attacking football, and of course they need to do that tonight. They will be trying because a draw just isn't good enough.
"Olympiacos will give their all tonight and hopefully the other results will be favourable for them.
"I do think it will be a narrow victory for Olympiacos. In front of their own fans, who are extremely passionate, I think they can get the win. But obviously it all depends on what happens in the other game tonight."