Denil Castillo is a 22-year-old professional football player from ECU. He currently plays for Midtjylland, wearing the number 21 shirt. At the international level, he represents Ecuador. He plays primarily as a Defender. He stands at 185cm tall and weighs 70kg. His current market value is estimated at 5.5M €.

His most recent move was a Free from FC Shakhtar Donetsk to Midtjylland on 2024-07-01. The reported fee was 4M €.

Throughout the Danish Superliga 2025-2026, Denil Castillo featured in 19 matches, averaging 1.1 tackles, 1 interceptions, and 1.4 clearances per game, while blocking 0.2 shots per game.