He currently plays for Oxford United, wearing the number 38 shirt. At the international level, he represents Northern Ireland U21. He plays primarily as a Midfield. His current market value is estimated at 1000K €.

His most recent move was a Free from Nottingham Forest U21 to Oxford United on 2026-01-18. The reported fee was 1.15M €.

Across 6 appearances in the English Football League Championship 2025-2026, Jamie Carson McDonnell registered 0 goals and 0 assists, while completing 1 key passes out of 97 total passes with a passing accuracy of 8.8.