Arsenal continue their Europa League campaign with a visit to Red Star Belgrade on Thursday night.
They are one of Eastern Europe's more well-known teams but have been out of the eye of the majority of football fans across Europe for much of the last two decades.
Sportsmail has taken a look at the team and provided a guide for fans who want to know a bit more about Arsenal's opponents.
Who are they?
Red Star, or Crvena Zvezda, are the most successful side in the history of Serbian football.