After beginning his career with Stalybridge Celtic, he signed a one-year contract with Oldham Athletic in July 2016. He scored his first goals for Oldham when he scored twice in an EFL Trophy tie against Carlisle United on 30 August 2016.
On 9 January 2018, after being released by Oldham, Osei joined National League side Maidstone United on a deal until the end of the 2017–18 season.
