He currently plays for Chelsea FC U19, wearing the number 6 shirt. At the international level, he represents England U17. He plays primarily as a Midfield.

His most recent move was a from Chelsea U18 to Chelsea U23 on 2024-07-01.

Across 2 appearances in the English Football League Trophy 2025-2026, Ollie Harrison registered 0 goals and 0 assists, while completing 1 key passes out of 140 total passes with a passing accuracy of 63.5.