We put together a quiz of some of our former international players to celebrate the World Cup view the gallery above and see the answers below...
1. STAN BOWLES - One of the most skilled players of his generations, Bowles enjoyed the heyday of his career at QPR where he won five England caps and later enjoyed two years at Orient between 1980-82. Renowned as a lively character, Bowles moved on to Brentford before retiring.
2. LAURIE CUNNINGHAM - One of the O's all-time greats, Cunningham was a trailblazer who paved the way for many more black footballers and began his career at Orient in 1974 before heading off to the likes of West Brom, Real Madrid and Manchester United. He won six England caps and sadly died in 1989.
3. JASON DEMETRIOU - A product of the O's youth system, Demetriou enjoyed five years as a pro with the club before leaving to play in Cyprus in 2010 - where he remains. Is now a regular for the Cyprus national team.
4. GLYN GARNER - The O's goalkeeper who was between the sticks in 2006 when the O's were promoted and received a full cap from Wales that year. Since then he has pursued a career in the non-league and is currently with Cirencester Town.
5. JOHNNY GORMAN - The winger has nine caps for Northern Ireland and was recently released by the O's having been a part of the squad for the 2013-14 season.
6. TONY GREALISH - An Orient legend who sadly passed away last year, Grealish began his career with the O's in the mid 70s and went on to reach almost 50 caps for the Republic of Ireland during a career that spanned over 20 years.
7. KEVIN LISBIE - Super Kev is still a regular for the O's at the age of 35, but has 10 caps for his country Jamaica from earlier in his career.
8. MARTIN ROWLANDS - The midfielder was signed by Russell Slade during the 2012-13 season and the former QPR man made a number of eyecatching performances and scored some spectacular goals. Has five caps for the Republic of Ireland and played for Aldershot last season.
9. CIARAN TONER - After being released from Spurs, he joined the O's in 2002 and made over 50 appearances, being called up for two Northern Ireland caps in that time. Left Orient in 2004 and has pursued his career up north since, last played for Gainsborough.
10. CHRIS ZORICICH - A defender who made 62 appearances for the O's in the early 90s before returning to his native New Zealand following restrictions with his work permit. Went on to captain his national team, winning 57 caps, and returned to England later in his career for a trial with Chelsea and then later playing in the non-leagues with the likes of Margate and Harlow.
11. GABRIEL ZAKUANI - Rose through the O's youth system and was a key part of the 2005-06 promotion team before becoming the Club's most expensive player when he moved to Fulham for over £1m. Went on to win 5 caps for DR Congo and recently re-signed for Peterborough United.
12. PHIL WOOSNAM - A tricky player who was a regular for the O's in the late 50s before a glittering career with the likes of West Ham and Aston Villa before heading to the USA and pioneering soccer in the States. Won 17 caps for Wales and was the cousin of golfer Ian Woosnam and sadly died last year.
13. ANDROS TOWNSEND - England star who will miss the tournament through injury, Townsend made 24 appearances for the O's on loan from Tottenham earlier in his career.