Melbourne coach Paul Roos has apologised over the “unacceptable” costumes Dean Terlich and Alex Georgiou donned at the AFL club’s Mad Monday.

Terlich dressed as convicted child sex offender Rolf Harris, while rookie-listed Georgiou donned pigtails and a dress to accompany him as a girl.

The pair face a club-imposed sanction that is yet to be determined.

“They were left in no doubt about my feelings on their behaviour yesterday. I think it’s just completely unacceptable,” Roos said on Tuesday about the dressing down he gave the duo.

“They did a lot more listening than talking.

“I was just speechless (when informed about the outfits). I just don’t understand it.

“The problem with days like yesterday is they just don’t think.

“There is no malice or intent in it, but there is just no thought process.”

On behalf of the Demons, Roos wanted to “unreservedly apologise to anyone that we have offended”.

Roos said Terlich and Georgiou were “extremely embarrassed” and “remorseful”.

Harris was earlier this year sentenced to five years and nine months jail in England after he was found guilty of 12 charges of indecent assault on four female victims between 1969 and 1986.