The Perth Glory are wary of being burnt by another unknown Queensland teenager at Suncorp Stadium when they confront a desperate Roar outfit on Saturday night.

Chris Grossman, temporarily promoted to the Roar's squad, is dreaming about replicating childhood friend and Young Socceroos team-mate Dario Vidosic's instant A-League success.

Vidosic, 19, stamped his mark on the competition in the opening round this season when he came off the bench on debut to engineer a 3-0 win over Perth by creating one goal and scoring another.

Grossman, also 19, was in the stands that night cheering on his Cavendish Road High schoolmate but now has his own chance after Frank Farina gave him the nod to cover Marcus Wedau (hamstring).

"Dario and I grew up together and to see him to take his chance when he got his chance was good," the energetic midfielder said.

"...So hopefully I can do something similar come Saturday night.

"If we do pair up in the midfield hopefully we can bring that little bit that we've been missing in the last couple of weeks."

Farina, whose two matches in charge have yet to reap goals or league points, has indicated Grossman will be used off the bench.

Perth skipper and surprise goal-sneak Jamie Harnwell said the sixth-placed Glory wouldn't underestimate the youngster.

"We hadn't seen too much of Vidosic either before he came on and he obviously hurt us," said Harnwell.

"We just have to be wary as they've got so many attacking players in their side."

The Perth skipper's form, including four goals in two games as an experimental centre forward, has seen coach Ron Smith keep him up front with Bobby Despotovski and Stu Young.

The Glory have lost Stan Lazaridis with a hamstring strain but have been compensated by the return of Simon Colosimo from suspension.

Classy Scotsman Simon Lynch is set to start for the seventh-placed Roar after returning to fitness after a string of leg problems.

Josh McCloughan, wearing the captain's again due to the automatic suspension of Chad Gibson, has labelled the match a grand final.

"A draw is no use to us and a loss is inconceivable. We simply have to win," said McCloughan.

Farina agreed, but didn't feel much had to change on-field apart from overcoming the ill-disciplines defensive errors that hurt the Roar against Melbourne (2-0) and Sydney (3-0).

"For the past two weeks we've basically shot ourselves in the foot and we've got to get rid of those errors and hopefully have a little bit of luck as well."

Harnwell's surprise success hasn't gone to his head and doesn't expect to feature on the score sheet for a third straight game.

"I'm just up there for nuisance value more than anything else," he said.

"I want to create things for other player but if a chance comes along hopefully I can get on the end of them."

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