He currently plays for Club Libertad Asunción, wearing the number 31 shirt. He plays primarily as a Defender. He stands at 175cm tall and weighs 75kg.

Throughout the Paraguayan Primera Division 2026, Thiago Ismael Fernández Martínez featured in 8 matches, averaging 0.1 tackles, 0.1 interceptions, and 0 clearances per game, while blocking 0 shots per game.