He is on the books of Sant Andreu and wears shirt number 24. His main role on the pitch is Defender. His estimated market valuation currently stands at 25K €.

His latest transfer saw him join Sant Andreu from UE Sant Andreu U19 via on 2024-07-01.

Across the Spanish Segunda División RFEF 2025-2026, Pablo Santiago Casellas appeared in 23 matches and averaged 0.1 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.