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Greek football turned professional after the 1958-59 season of the Panhellenic Championship. From 1959 to 2005, the Alpha Ethniki was the first division in Greece. In 2006, this competition was replaced by the Greek Super League. For the professional era, Olympiacos has the most titles, 26, including the last 4 championships. Panathinaikos has the second most, 16 (the last in 2004); AEK Athens is third with 9 (but none since 1994). These three clubs, all from Greater Athens, comprise the big 3 in Greece. AEK and Pana are both from Athens proper; Olympiacos are from the port city of Piraeus, just west of Athens.
The Olympiacos v. Panathinaikos derby is the biggest in the country. Here is an article on the rivalry, from the Bleacher Report site {Click here}. On 9th November, Panthinaikos hosts Olympiacos. For the Greek Super League table and all matches, {Click here (SoccerStats site) }.
There are only two other clubs who have won a pro title in Greece. They are PAOK Thessaloniki, who have been champions twice (last in 1985); and Larisssa (champs once, in 1988). PAOK Thessaloniki are from Salonika, Greece’s second largest city. Larissa hail from the region of Thessaly, in central Greece.
To see a map of the regions of Greece, {Click here}. Here is a list of clubs in the league this season, by region {Click here}.
Greece’s domestic league is currently ranked #14 by UEFA for competition in Europe {see this}.
Currently playing in Europe. In the Champions League, Panathinaikos, in Group B. {See this, from Wikipedia…the page has been updated to include breakdowns of the scenarios of all the games on Matchday 4, which is to be played on 4th and 5th November).
In the UEFA Cup Group Stage, the only Greek team competing this season is Olympiacos {see this}. [In the 07/08 UEFA Cup Group Stage, there were 5 clubs from Greece...Panathinaikos, AEK Athens, Aris Thessalonika, Larissa, and Panionios.]
Thanks to the EFS site, for the attendance figures {Click here}.