Arsenal full-back Hector Bellerin backed the Gunners be a force in the Champions League after helping to keep their challenge alive with a 3-0 win over Dinamo Zagreb on Tuesday.
Mesut Ozil opened the scoring before Alexis Sanchez netted two goals either side of half-time to complete a comfortable victory.
Arsene Wenger's men must now beat Olympiacos by two goals in their last Group F fixture in Greece to guarantee their progression to the last 16, and Bellerin is confident of going a long way in the tournament.
"The team know it was an important day today and we had to turn up," he told BT Sport . "We're going to play for our lives [at Olympiacos] but this was an important test and the team responded very well.
"We've shown all through the season a lot of quality, a lot of creativity and we're defending very solidly. I think we're going to be a team that's going to be up there [at the end of the competition]."