Olympiacos F.C. in European football

Olympiacos F.C. is a Greek football club based in Piraeus. It has a long presence in UEFA competitions, making its debut on 13 September 1959, against AC Milan for the 1959–60 European Cup, the first Greek club to compete in a UEFA–sanctioned European competition.

Source: Wikipedia — Olympiacos F.C. in European football (CC BY-SA 4.0)