Having joined Southampton's academy in May 2012,[2] Finnigan signed a professional contract with the club in December 2020.[3] On 19 January 2021, Finnigan made his first professional appearance in Southampton's victory over Shrewsbury Town in the FA Cup.[4]
Crewe Alexandra (loan)
On 18 January 2023, Finnigan joined League Two side Crewe Alexandra for the remainder of the season,[5] making his Crewe debut against Stockport County at Gresty Road on 31 January 2023.[6] In his fifth appearance for the Railwaymen, he scored his first professional goal, helping Crewe to a 2–0 home win against Hartlepool United on 14 February 2023.[7]
Crewe Alexandra (loan)
On 1 September 2023, Finnigan joined League One side Shrewsbury Town on a season-long loan.[8] He made his debut for the club on 5 September 2023 in a 3–0 defeat to Forest Green Rovers in the EFL Trophy.[9] At the end of September, Finnigan suffered an ankle injury during training and was expected to be sidelined for several months.[10]
Blackpool
On 31 January 2024, Finnigan was recalled from loan and joined League One side Blackpool on a permanent transfer for an undisclosed fee.[11] He scored on his debut for the club, a 4–0 over Burton Albion in the first round of the EFL Cup on 13 August 2024.[12]