That's the message coming from Canberra Raiders five-eighth Jack Wighton - he would know, he once shared a combination with his "freakish" Brisbane Broncos counterpart.

The Broncos have won just one of five games to open their season, in stark contrast to the high-flying Raiders leading into their NRL round six showdown at Canberra Stadium on Sunday.

Rugby league's eighth Immortal Andrew Johns has slammed Milford as Brisbane's disjointed attack threatens to put them behind the eight ball in the race to September.

But Wighton is expecting the Broncos playmaker to be at his scintillating best when he locks horns with the Raiders this weekend.

"Milf is a freakish player. We're going to have to be on our game, he always plays good against us and brings his A-game," Wighton said.

"We know Milf and the Broncos are coming down here to do a job on us, so we're going to have to turn up and be ready for them. He is just a class player, all-round.

"If you look at their team, they've got a great team and a very dangerous team. Anything could happen so we've got to be on our game."

Sam Williams has forced his way into Canberra's No. 7 jersey on a weekly basis having steered the Green Machine to three consecutive wins in Aidan Sezer's absence.

Raiders coach Ricky Stuart says Williams' recent display of class in the chief playmaker role makes it almost impossible to bring Sezer back in even if he is fully fit.

Throw that in with Wighton's emergence as a quality five-eighth and the Raiders mentor has one of those more pleasant selection headaches - if there is such a thing.

"Sammy and Aidan in my eyes are both equally great players. To finally have that depth in the team is unbelievable. I love playing with both of them so it's really good," Wighton said.

"[Depth], it's everything. We've got young forwards coming through, we've got young halves, we've got young wingers coming through. You just go to bed every night knowing there is something chasing your tail and you've got to be on your game.

"It's really healthy for the club. Another good weekend, we've got three wins in three games and that always feels really good."

That depth was so nearly tested in Canberra's shutout win over the Parramatta Eels - Wighton almost wasn't there at all.

"I didn't train on two of the days during the week, my hips fell apart on Tuesday night," Wighton said.

"We've got a really good physio team here, and doc, so they looked after me right and I did the right stuff, and I came good on game day.

"I just think it was the big travel from Townsville, sitting down on the plane and going into a good day's training, it was just things were a little unstable.

"Nothing big, it just pulled me up for a couple of days. To be fair, it was probably good to get off my feet for a little while."

Joe Tapine is awaiting scan results after being taken from the field with an ankle injury which threatens to add to an already frustrating 2019 campaign for the New Zealand international.

Tapine has been limited to three games this season - and in two of those he has failed to reach the final siren.