By Scott Trotter Erik ten Hag has blasted the treatment of Manchester United star Casemiro by Premier League referees. The Dutch manager labelled the treatment of the former Real Madrid midfielder as ‘crazy’ as he picked up a fourth yellow card of the season. Ten Hag believes he was forced to replace Casemiro in the second period of United’s win over Luton Town for fear of his charge being unfairly sent off. While the Brazilian has yet to pick up a ban in the Premier League this term, he has earned three yellow cards in his last four league fixtures and eight in his last nine Man United outing…