The last time Arsenal made the quarter-finals of the Champions League was the 2009-10 season. The team they beat in the last 16? Porto.
That is the same challenge facing Mikel Arteta's side this season as they look to reach the last eight for the first time in 14 years.
Arsene Wenger's side lost 2-1 away in 2010 but then thrashed the Portuguese side 5-0 at home to progress.
Can you name the side that started that day? One clue for you, one of the scorers came off the bench so isn't a name you're looking for.