He currently plays for FC Sion, wearing the number 38 shirt. At the international level, he represents Switzerland U20. He plays primarily as a Defender. His current market value is estimated at 350K €.

His most recent move was a Free from Aarau to FC Sion on 2026-02-11.

Throughout the Switzerland Super League 2025-2026, Ryan Kessler featured in 2 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.