Finnerhan signed for Northwich in 1891. Northwich lost their Football League status in 1894, and Finnerhan joined Manchester City in the close season. He made his Manchester City debut in the opening match of the 1894-95 season, a 4-2 Second Division defeat to Bury. He scored his first goal for the club on 8 September 1894 against Burslem Port Vale. He played in every Manchester City match that season, finishing as the club's leading scorer with 15 goals. In October 1894 Manchester City signed Finnerhan's former Northwich strike partner Billy Meredith.
In March 1897, having made 89 appearances for Manchester City, Finnerhan transferred to Liverpool. He made eight appearances for Liverpool, scoring one goal, against Wolverhampton Wanderers. He then moved to Bristol City of the Southern League.
- "Famous Vics players". Drill Field Den. Retrieved 2007-05-29.
- James, Gary (2006). Manchester City - The Complete Record. Derby: Breedon. ISBN 1-85983-512-0., p274-279
- Baskcomb, Julian (ed.) (1997). Manchester City F.C. Official Handbook 1997-98. Leicester: Polar. p121
- "Player Profile: Patrick Finnerhan". LFCHistory.net. Retrieved 2007-05-29.
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