Aiden O'Brien

Millwall

Born in Islington, London, O'Brien started his career in the youth system at Millwall and signed his first professional contract in 2010 on his 17th birthday. He made his debut for the club in the League Cup third round 5–0 defeat to Wolverhampton Wanderers, coming on as a substitute for Dany N'Guessan. On 1 January 2012, O'Brien signed for Conference South side Staines Town on a one-month loan. A month later, O'Brien signed for Conference Premier side Hayes and Yeading on a one-month loan and immediately found himself playing games. In May 2014, O'Brien agreed a new two-year deal with Millwall with the 20-year-old being highly regarded by Millwall manager Ian Holloway. O'Brien made his first appearance of the 2014–15 season coming on as a substitute for Richard Chaplow against Southampton in the League Cup. The game finished 2–0 to Southampton. A month later, in September 2014, he made his first league appearance for Millwall in a 3–1 defeat to Birmingham City. O'Brien spoke of his delight of fulfilling a lifelong ambition when he made his league debut for Millwall and has dedicated the achievement to his father. At the end of the 2017–18 season, his contract was extended by Millwall after the club exercised an option. He left Millwall at the end of 2019–2020 season, after his contract expired.

Sunderland

On 30 July 2020, O'Brien signed for Sunderland, on a two-year deal. On 8 September 2020 he scored his first goal for Sunderland in an EFL Trophy…

On 6 February 2013, O'Brien scored on his debut for the Republic of Ireland U21s against Netherlands in a 3–0 win at Tallaght Stadium. O'Brien then scored his first competitive goal and his third goal for Ireland in 4–1 away win against the Faroe Islands. On 15 November 2013, O'Brien scored another two goals against the Faroe Islands in a 5–2 win at The Showgrounds. O'Brien scored five times for the U21s, placing him two goals off Robbie Brady's all time goal scoring record of seven. In September 2017, O'Brien was called up to the senior Republic of Ireland squad for 2018 FIFA World Cup qualifiers against Moldova and Wales. On 11 September 2018, O'Brien scored his first senior international goal for Ireland on his debut in a friendly against Poland in Wrocław which finished 1–1. The goal would later be named as the 2018 FAI International Goal of the Year.

Club

As of match played 29 September 2026

International

Scores and results list Republic of Ireland's goal tally first, score column indicates score after each O'Brien goal.

Millwall

EFL League One play-offs: 2017 Sunderland

EFL Trophy: 2020–21 Individual

EFL League One Player of the Month: October 2015 FAI International Goal of the Year: 2018 Shelbourne

League of Ireland Premier Division: 2024