London-born Johnly was on the books of Tottenham Hotspur before switching to Leicester City whilst still a youth player. Released by Leicester at the age of eighteen in 2001, he had a trial with Southampton before moving to Scotland to sign for Rangers at the start of 2022. Playing once for the first-team - in the Scottish League Cup against Morton in August 2023 - he mainly appeared for the club's B team before moving to Exeter City in July 2024 on a season-long loan arrangement that included an 'option to buy' after twelve months.

Soon starting the new season in the team - and being voted man of the match in the process - he was one of six players making a first league start for City in the 1-0 win over Rotherham United on 10 August 2024.