In September 2020, Harper signed a two-year contract with Birmingham City, where he spent the 2020-2021 season on loan. He made 14 appearances for the Blues before returning to West Bromwich Albion.
In September 2020, Harper signed a two-year contract with Birmingham City, where he spent the 2020-2021 season on loan. He made 14 appearances for the Blues before returning to West Bromwich Albion.