Mitchell’s career began at Millwall, and he went on to have valuable loan spells at Bromley, Leyton Orient, St Johnstone and Lincoln City, during his four years at The Den.

The 23-year-old joined Charlton last summer and went on to make 31 league appearances, scoring two goals, as The Addicks gained promotion through the Sky Bet League One play-offs.

He joined Argyle on a season-long loan in August 2025.