GOLD Coast coach Guy McKenna says Fremantle are not invincible, believing his side has a great opportunity to challenge one of the best teams in the competition at Patersons Stadium on Saturday night. 

McKenna conceded Ross Lyon's outfit had no obvious weaknesses, but is convinced the Dockers can be beaten despite Fremantle losing just one game at home in the past 20 months. 

"They're not perfect," McKenna said.

"Use all the clichés like Leigh Matthews has done before, 'if it bleeds you can kill it'. 

"Maybe some of their players, maybe some of their fans, have already locked away four points. Maybe they're not going to take us seriously, I don't know."

Gold Coast is yet to win in four previous matches at Patersons Stadium, and McKenna says he knows Lyon well enough to understand the task that his young side faces.

"Predictable coach, predictable team - hard, well disciplined," McKenna said. 

"We know what we're going to get. So it's not for us to be on the back foot and wait for that test. It's for us to get out on the front foot and test them.

"The way they set up defensively on a skinny ground makes their defensive mechanisms very easy to carry out and very hard to get through."

Coming off an 18-point win over Richmond in round one, McKenna believes his side can stretch the Dockers for leg-speed through the midfield at Patersons Stadium, but is aware that the big bodies in the Fremantle onball brigade pose a threat. 

"We may have them for speed through the midfield," McKenna said. 

"But certainly big, strong 27-year-old bodies that have played between 100-150 games, we don't have them there, that's for sure.

"Our greatest challenge is probably not Fremantle. Our greatest challenge is consistency. That's what we need. We need to turn up and play better than last week if we are to knock off Fremantle."

McKenna says it is a great opportunity for young Suns ruckman Tom Nicholls to face three-time All Australian Aaron Sandilands in just his 11th game.

"It's fantastic that he gets that opportunity," McKenna said. 

"(He's) shown his athleticism has be fantastic and his ability to run and jump. 

"Because he's a big lad, he's over 200cm, he doesn't come up against someone of this size and stature too often. But when he does, he's got tactics he uses as well, and certainly his athleticism is a part of that."