Why did Messi’s old football trainer threaten to sue Barca?

Messi’s former trainer, Quique Setien, threatened to sue Barca in court after being sacked last month by the club for his poor performance during the season. Coach Quique Setien and 3 assistants Eder Sarabia, Jon Pascua, and Fran Soto threatened to sue Barca in court for not being treated fairly in the labor contract issue. […]