*Club domestic league appearances and goals, correct as of 17:28, 30 December 2023 (UTC) ‡ National team caps and goals, correct as of 12:57, 16 September 2020 (UTC)
Brennan joined Sheffield Wednesday in 2013, joining the U14 group, before progressing through the clubs youth academies.[2] He would sign his first professional contract on 3 May 2018,[3] later renewing his contract at the club for a further year at the end of 2019 season and again in 2020.[4][5] On 15 September 2020, he would make his first team debut at Sheffield Wednesday, starting the game against Rochdale in the second round of the EFL Cup.[6] The club activated a one-year extension to his contract on 20 May 2021.[7] After his Notts County loan, he would break into the first time on a more regular basis, which would see him sign a new contract until the summer of 2024.[8][9] On 17 May 2024, it was confirmed he would be released following the expiration of his contract.[10]
Loan Spells
On the 20 September 2019, Brennan was sent out on a one month loan to Gainsborough Trinity, which would see him play five games before returning to Sheffield Wednesday with the clubs player of the month award.[11][12] On 22 September 2021, Brennan joined Notts County on a short term loan until 27 November.[13] The loan was cut short on 8 November 2021 after featuring 5 times in all competition.[14] On 1 July, it was announced that Brennan had joined Swindon Town on loan for the season.[15] He made his Swindon debut against Harrogate Town on the opening day of the season.[16] He would pick up a season-ending shoulder injury against Harrogate Town on 25 February 2023 and would return to his parent club.[17] On 4 December 2023, Brennan joined Hartlepool United on a short term loan.[18] He made his Hartlepool debut on 9 December in a 5–1 FA Trophy win against City of Liverpool.[19] On 5 January 2024, it was announced that his loan spell with Hartlepool had ended.[20]
Newport County
On 25 June 2024, Newport County announced Brennan would join them on 1 July 2024 signing a two-year deal.[21]
International career
Brennan got his maiden call-up to the Republic of Ireland U21 team for the first time on 25 May 2021 to play in games against Switzerland, Denmark and Australia.[22] However he would later have to withdraw from the squad due to illness.[23]
Career statistics
As of match played 30 December 2023
Appearances and goals by club, season and competition
This biographical article related to association football in England, about a defender born in the 2000s, is a stub. You can help Wikipedia by expanding it.