Population of Greece: 10.8 million {2011 census}. Capital and largest city: Athens, pop. 3.7 million (metro-area pop.) {2011 census}.

-Greece coach, Fernando Santos. Fernando Santos.
-Greece squad captain, Giorgos Karagounis. Giorgos Karagounis.

Below: Theoretical Best XI for Greece (with 3 other player-options further below) -

Photo and Image credits above -
Greece home jersey badge, photo from
Greece 2012-14 home jersey, photo from pjwapparel.com/2012-2014-Greece-Home-Jersey.
Greece/EU map, by NuclearVacuum at ‘File:EU-Greece.svg‘ (en.wikipedia.org).
Greece map by Lencer at ‘File:Greece location map.svg‘ (en.wikipedia.org).
Coach,
Fernando Santos, photo unattributed at standard.co.uk/sport/football/secret-of-greek-success—–smoking.
Goalkeeper,
Orestis Karnezis (Udinese/Granada), photo by Vladimir Rys/Getty Images Europe via zimbio.com.
Defenders,
Vasilis Torosidis (Roma), photo by Warrenfish at en.wikipedia.org/wiki/File:Vasilis_Torosidis_MLS_AllStar_2013.jpg.
Sokratis Papastathopoulos (Borussia Dortmund), photo by Reuters via sports.terra.com.
Dimitris Siovas (Olympiacos), photo by Valerio Pennicino/Getty Images Europe via zimbio.com.
José Holebas (Olympiacos), photo by AFP/Getty Images via uefa.com.
Midfielders,
Giannis Maniatis (Olympiacos), photo unattributed at redarchivesblog.blogspot.com.
Giorgos Karagounis (Fulham), photo by Laurence Griffiths/Getty Images Europe via zimbio.com.
Alexandros Tziolis (PAOK/Kayserispor), photo by kayserispor.org.tr.
Forwards, attacking MFs,
Dimitris Salpingidis (PAOK), photo from gazzetta.gr/sites/default.
Konstantinos Mitroglou (Fulham), photo by Stu Forster/Getty Images Europe via zimbio.com.
Georgios Samaras (Celtic), photo by Getty Images/Getty Images Europe via zimbio.com.
Other player-options,
Loukas Vyntra DF/CB/RB (Levante), photo by Manuel Queimadelos Alonso/Getty Images Europe via zimbio.com.
Andreas Samaris MF/CM (Olympiacos), photo unattributed at greekbulldog.blogspot.com.
Lazaros Christodoulopoulos LW/AMF/RW (Bologna), photo by Getty Images via goal.com/it/news/2/serie-a.
___
Thanks to the contributors at ‘2014 FIFA World Cup qualification‘ (en.wikipedia.org).
Thanks to the contributors at ‘Greece national football team‘ (en.wikipedia.org).
Thanks to http://www.transfermarkt.com/en/, for player-position details.
Thanks to Soccerway.com, for recent squad line-ups (with positions-on-the-field graphics), at int.soccerway.com/international/europe/wc-qualifying-europe/2014-brazil/1st-round/r15653/.

…
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}.