PM tips Tigers and the Cowboys to win

Prime Minister Malcolm Turnbull has picked Richmond to win the AFL grand final and "sentimental favourite" North Queensland to prevail in the NRL.

He tipped the Tigers to win by five points on Saturday and went for the Cowboys over the Storm by four points on Sunday night

"All of you here have forgotten more about AFL than I have ever learnt. I say this with modesty and humility, based on my advice... I would say Richmond by five," Mr Turnbull told the Nine Network on Friday.

He was more confident tipping the Cowboys to win and labelled them the sentimental favourites over the Melbourne Storm.

Mr Turnbull also promised a strong security presence at the grand finals.

"We always try to make the security as unobtrusive as possible but people will notice more security," he said.