Joel Campbell says Wednesday’s Champions League clash at Olympiacos is Arsenal’s “most important game of the season so far”.
The Gunners head to Greece knowing they must win by two goals, or win by a one-goal margin and score at least three times, if they are to qualify from Group F.
Campbell - who spent the 2013/14 season on loan at Olympiacos - accepts that it is a big challenge, but says the team are determined to succeed.
"[The win over Sunderland] was a good result for the team,” he said. “We got the result and that's what we wanted. Now we have to prepare mentally and physically for Wednesday's game because it will be very difficult.
“We already played against Olympiacos at Emirates Stadium. They are a great team, a great rival and especially because they play at home.
“In the Pireo (Karaiskakis Stadium) it is very difficult to get points but it is the last game of the group stage and we will give our best.
“It is the most important game of the season so far. It will be a cup final and we have to win to continue in the Champions League.”
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