According to JAR-FCL, the MCC course is intended to provide MCC training in two circumstances: either for be a graduate of an integrated ATPL course or for PPL/IR or CPL/IR holders [JAR-FCL 1.261(d)(1)] (This means a JAA PPL/IR or CPL/IR holder [JAR-FCL 1.005(a)(2)]).
Whether individual member states and training providers abide by these requirements is, of course, quite another matter.