On 20 July 2014, Sydney FC announced that they had signed Gersbach to a two-year deal. Alex was previously given the number 13 jersey, but later swapped with Christopher Naumoff for the number 16. Rated as one of Australia's most promising young footballers, he made his senior professional debut for the club at the age of 17 years and 3 months in the 2014 FFA Cup Round of 32 tie against Melbourne City FC at Morshead Park on 12 August 2014 which Sydney FC won 3–1 after extra time.[6][7]
He made his A-League debut on 11 October 2014 against Melbourne City when he came on for Matthew Jurman after 69 minutes.[8] He put in a promising performance as Sydney FC drew 1–1.
On 31 January 2016, it was announced that Gersbach had signed with Norwegian club, Rosenborg BK of the Tippeligaen for a reported fee of $500,000.[9] Gersbach made his Tippeligaen debut for Rosenborg on 19 March 2016 at home to Stromsgodset where he played a full 90 minutes in a 1–0 home victory.
Loan to Lens
On 22 January 2018, Lens announced the signing of Gersbach on a six-month loan deal, with the view to make it a permanent three-year deal at the end of his stint.[10] Given the number 5 jersey, Gersbach made his debut in an unfamiliar centre-back role in a 1–0 loss to US Orléans.[citation needed]
NAC Breda
On 23 January 2019, NAC Breda announced the signing of Gersbach on a 2.5 year contract.[11]
AGF
In July 2019, Gersbach moved to Denmark and joined AGF on a 3-year contract, also getting reunited with his former teammate from the national team Mustafa Amini.[12]
Grenoble
On 31 August 2021, Gersbach secured a move to French Ligue 2 team Grenoble on a 2-year contract.[13]
Colorado Rapids
After playing two seasons for Grenoble, Gersbach joined Major League Soccer team Colorado Rapids on 30 January 2023 for a reported fee of €300.000. Gersbach signed a three-year contract with a club-held option for the 2026 MLS season and occupies an international roster spot.[14][15][16] Gersbach made his debut for the Rapids starting in a 4-0 defeat to Seattle Sounders FC on 26 February 2023.
Kalmar FF
On 21 March 2024, Gersbach signed for Kalmar FF on 1.5 year long contract.[4]
International career
On 25 September 2015, Gersbach was selected to play for the Young Socceroos to play in the 2016 AFC U-19 Championship qualification. In March 2016 Gersbach received his first call up to the senior team when he was named in the squad to face Tajikistan and Jordan in World Cup Qualifiers on 24 and 29 March.
On 4 June 2016, Gersbach made his first international appearance for Australia, coming on for Brad Smith against Greece in the 82nd minute and later setting up Mathew Leckie's last second winner.[17]
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