Two key organelles directly involved in mitotic cell division are the centrosome (which contains centrioles) and the nucleus. The centrosome, with its centrioles, helps organize the mitotic spindle, while the nucleus houses and organizes the genetic material (chromosomes) during the division process. 

Centrioles are cylindrical structures found in animal cells and are essential for cell division. They organize the mitotic spindle, a structure that ensures accurate chromosome separation during mitosis.