Adelaide United coach Aurelio Vidmar says his side has yet to prove it's worthy of a top two A-League ranking.

The Reds will rise to within one point of second-placed Queensland with a home victory against bottom-placed Perth Glory on Friday night.

Perth coach David Mitchell has said all the pressure will be on United to stake their top two claims in the Hindmarsh Stadium encounter, a theory rejected by Vidmar.

"There's no pressure on us," Vidmar said.

"I see that he (Mitchell) said that we need to get into the top two.

"We're far from a top two side, so it's no problem for us.

"We're just playing at home and we want to win the game, it's as simple as that."

"It's definitely a big game for us and one we need to win."

Vidmar said he would seek further improvement against the Glory after Adelaide's 1-1 draw against Newcastle last start.

"I think we took a step forward against Newcastle considering the last two games we played before that, so we're looking for continued improvement and it's really getting to a crucial stage of the year," he said.

Adelaide hasn't won for three games, and their past two fixtures against Perth have resulted in scoreless draws.

The Reds will be without club champion Jason Spagnuolo (knee) while midfielder Jonas Salley has been omitted.

However, United will be bolstered by the return of explosive Brazilian defender Cassio, who has recovered from a hamstring strain, while 23-year-old Fabian Barbiero has been named for his first A-League match and will start on the bench.