In 1992–93 a promotion/relegation play-off was also introduced. Between 2008 and 2011, A Championship teams were also eligible for promotion to the First Division. During this time both Mervue United and Salthill Devon were both promoted to the First Division from the A Championship. There is no formal promotion and relegation relationship between the First Division and the three third level provincial leagues – the Leinster Senior League Senior Division, the Munster Senior League and the Ulster Senior League. However provincial level teams have been invited to join the division. In 1990–91 St James's Gate were invited to join and in 1996–97 they were replaced by St Francis. In 2015, Cabinteely became the most recent team to accept an invite. All three clubs were recruited from the Leinster Senior League