Originally joining the academy set-up on transfer deadline day in January 2023, Harry Vaughan signed from National League outfit Oldham Athletic following a successful trial.

A former Manchester United youth, Vaughan made 40 appearances for Oldham, featuring in League Two, FA Cup, EFL Trophy, EFL Cup and National League.

Capped at Under-18s and Under-19s level for Republic of Ireland, along with being called up to the Under-21s, the former Radcliffe loanee registered four assists for Oldham, scoring two goals against Sunderland and Harrogate Town respectively.

In April 2023, Vaughan made his first-team debut in a goalless draw away at Blackburn Rovers in the EFL Championship. Winning the club's Player of the Month award for April, the attacking midfielder started the final five EFL Championship fixtures for the Tigers.  

In January 2024, Vaughan joined Sky Bet League One side Bristol Rovers on loan for the remainder of the 2023/24 campaign, making 11 appearances in total. 

Returning to the Tigers' Under-21 side, his solo goal against Leicester City Under-21s in the Premier League Cup won the club's Uber Eats Goal of the Month award for November 2024, as well as making his Republic of Ireland Under-21 debut against Sweden.