He is on the books of Chelsea FC U19 and wears shirt number 6. At international level, he features for England U17. His main role on the pitch is Midfield.

His latest transfer saw him join Chelsea U23 from Chelsea U18 via on 2024-07-01.

Over 8 appearances in the UEFA Youth League 2025-2026, Ollie Harrison contributed 0 goals and 0 assists, completed 4 key passes from 571 total passes, and posted a passing accuracy of 67.6.