Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Igor of ák (born 10 April 1983) is a Slovak football midfielder who currently plays for the Slovak Corgo Liga club K Slovan Bratislava and Slovakia national football team. Association football, commonly known as football or soccer, is a sport played between two teams of eleven players with a spherical ball. At the turn of the 21st century, the game was played by over 250 million players in over 200 countries, making it the world's most popular sport.