During an interview with Triple M prior to Collingwood's clash with Fremantle, Malthouse was critical of the decision to restrict the number of interchanges during NAB Cup matches.
"I like the pre-season competition, I think it is excellent outside of some of the stupid rules, which are, incidentally, instigated by stupid people," Malthouse said.
"You don't have to be blind Freddy to work out that 16 interchanges is absolutely ridiculous made by ridiculous people."
The AFL will not take action against Malthouse following his apology.
