And while most of you will be more than familiar with the rules and Gaelic football is played with a ball that is slightly smaller than that used in. Gaelic football commonly referred to as football or Gaelic, is an Irish team sport. It is played between two teams of 15 players on a First played : . Rules of Gaelic Football. Playing field. A Gaelic football pitch is similar in some respects to a rugby pitch but considerably larger. The grass pitch is rectangular.