Sheffield Wednesday
He signed his first professional contract with the Sheffield Wednesday on 3 July 2024. After a summer of turmoil, he joined the first team ahead of the 2025–26 season. On the 13 August 2025, he made his professional debut in the EFL Cup against Bolton Wanderers, playing the full 90 minutes as well as scoring Wednesday's third goal in a 3–3 draw, where the young side would go onto winning on penalties. Three days later, he made his senior league debut, replacing Liam Palmer on the 85th minute against Stoke City. At the start of September, manager Henrik Pedersen moved Johnson, alongside teammates Ernie Weaver, Jarvis Thornton and goalkeeper Logan Stretch into the first team dressing room. However, in the next game against Grimsby Town he would pick up a foot injury which required stitches, meaning he would be out for two-to-three weeks. On 20 January 2026, he made his first league start, playing the full 90 minutes against Birmingham City. Following the end of the 2025–26 season, the club confirmed that they had offered him a new contract.
On 29 July 2026, Johnson signed a new one-year contract at Sheffield Wednesday, with a further one-year option, before immediately joining Eastleigh on a season-long loan for the 2026–27 season. He made his debut against Kidderminster Harriers on 15 August, playing the 90 minutes.
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