Joan Martinez is a 19-year-old professional football player from ESP. At the international level, he represents Spain U17. He plays primarily as a Defender. His current market value is estimated at 3M €.

Throughout the Primera Federación 2025-2026, Joan Martinez featured in 21 matches, averaging 0.1 tackles, 0.2 interceptions, and 0.6 clearances per game, while blocking 0 shots per game.