He played in Minor league baseball as a catcher from 1983 to 1984 for the Oakland Athletics and Toronto Blue Jays organizations.

[3] He threw and batted right-handed, stood 6 feet 2 inches (1.88 m) tall and weighed 185 pounds (84 kg) as an active player.

[3] After managing in the farm systems of the Cincinnati Reds, Houston Astros and Chicago White Sox, Rojas joined the Detroit Tigers' organization in 2004.

He skippered the Triple-A Toledo Mud Hens in 2007, the first of his two, one-year stints in that job, and led the club to an 82–61 win–loss record and a playoff berth.

[6] In 2017, a decade after his original Toledo assignment, he managed the Hens to a 70–71 record and a third place finish in the International League's West Division.