Niklas Horst Castelle is a 24-year-old professional football player from GER. He currently plays for Alemannia Aachen, wearing the number 44 shirt. He plays primarily as a Forward. His current market value is estimated at 225K €.

His most recent move was a Loan from Alemannia Aachen to SSV Ulm 1846 on 2026-06-30.

In the German 3.Liga 2025-2026 season, Niklas Horst Castelle scored 1 goals and provided 1 assists across 22 appearances, averaging 0 goals per game with 20 shots attempted and 4 on target.