John O'Sullivan

In the summer of 2009, O'Sullivan, aged 15, joined Premier League side Blackburn Rovers from Dublin-based Belvedere, a youth club that's well known for its youth system which has successfully produced dozens of players who have gone on to play football throughout the United Kingdom and Ireland. Working his way through the ranks at Rovers, from the academy to the Reserves, O'Sullivan begun to be featured in match day squads as an unused substitute during the 2012–13 Football League Championship campaign, the club's first season return in the second tier of English football having been relegated from the Premier League in May 2012. On 4 May 2013, O'Sullivan made his senior professional debut for Rovers in their final game of the season, coming on as a second-half substitute against Birmingham City. On 9 January 2014, O'Sullivan joined Conference Premier side Southport on a one-month loan deal. On 2 February, the loan was extended until the end of the season. He scored his first goal for Southport on 22 February 2014 in a 3–1 away defeat against Forest Green Rovers. On 19 September 2014, O'Sullivan joined League Two outfit Accrington Stanley on a one-month loan deal. On 20 October 2014, the loan was extended until 20 December 2014. O'Sullivan scored 4 goals in 13 appearances. He joined League One club Barnsley on a one-month loan deal on 19 February 2015, and made 8 appearances on loan at the club. On 26 November 2015, O'Sullivan joined Rochdale on loan until 3 January. He made…

O'Sullivan made his debut for the Ireland national under 15 team in 2008, he won international u16 player of the year. He has been called up at all age groups to the Republic of Ireland U21s. In 2011, he featured in all the games for Ireland u19 team that reached the semi-final of the euro finals.

As of match played 23 July 2025

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EFL League Two play-offs: 2021 Bohemians

Leinster Senior Cup: 2022–23 Shelbourne

League of Ireland Premier Division: 2024 President of Ireland's Cup: 2025