for curiosity and because i'm very excited expecting the opening match i made this list of the clubs more represented in the Euro2004:
9 players:
Barcelona, Juventus,
8 players:
Real Madrid, Benfica, AC Milan, Manchester U., Inter, Chelsea,
7 players:
FC Porto, Lazio, Panathinaikos, Arsenal, Liverpool, PSV, Skonto Riga,
6 players:
AEK, Ajax,
5 players:
Deportivo, Lokomotiv Moscow, Zenith, CSKA Moscow, AS Roma, Valencia, Bayern Munich,
4 players:
Olympiacos, Monaco, FC Basel, Aston Villa, Levski Sofia,
3 players:
Sporting, Tottenham, Marseille, Shakhtar Donetsk, Fenerbahçe, Dinamo Kiev, Leverkusen, Kaiserslautern, Grasshopper, Rennes, Lyon, Everton, Dortmund, Udinese, Brondby, Ventspils, Sparta Prague, Celtic, Litex Lovech
2 players:
Portsmouth, Krilya Samara, Torpedo Moscow, Bolton, Werder Bremen, Bilbao, Real Sociedad, Betis, Hertha Berlin, Stuttgart, Ancona, Club Brugge, Hamburg, Manchester City, Schalke 04, CSKA Sofia, Fulham,Banik Ostrava, Rangers, Heerenveen, Southampton, Lokomotiv Plovdiv
1 player:
Paris-SG, Braga, Dinamo Moscow, Celta Vigo, Rubin Kazan, Rotor Volgograd, Leicester, Fiorentina, Grazer AK, Hajduk Split, Maccabi Haifa, Austria Vienna, M'gladbach, WBA, Freiburg, Young Boys, FC Zurich, St. Gallen, FC Thun, Nantes, Auxerre, Sochaux, Leeds, Newcastle, Watford, Charlton, Murcia, Midtylland, Genk, AZ Almaar, Liepaja, Metalurgs, Luch Energia, Maccabi Tel-Aviv, Yaroslavl, Rostov, Beveren, Admira Wacker, Viborg, Slovan Liberec, Gaziantepspor, Lille, Wolfsburg, Lecce, Parma, Chievo, Middlesbrough, Reggina, Slavia Prague, Munich 1860, Bochum, Aalborg, Djugardens, Halmstads, Hammarby, Belenenses, Strasbourg, Anderlecht, Helsingborgs, FC Copenhague, Istanbulspor