Risdon's stocks have risen dramatically this season after producing a standout campaign for Perth Glory, who may also make a move for another Socceroos defender in Rhys Williams.

Risdon, who made his Socceroos debut last November, secured his place in Ange Postcoglou's 23-man squad for this month's two home FIFA World Cup Qualifiers against Tajikistan and Jordan.

The 23 year-old had the option of heading overseas at the end of this 2015/2016 campaign, but Risdon said he felt his development would be best served by spending at least one more season in the A-League.

"It's something I've always wanted to achieve - to go overseas and play at the highest level I can," Risdon said.

"If it happens in the future, I'll definitely take the opportunity.

"But I'm really enjoying myself at Glory, and the team's doing well. I'm playing regularly here.

"Being part of the Socceroos for the next year or so is a big goal of mine.

"Hopefully (playing regularly for Perth) will be enough to be involved in the national team."

Meanwhile, Castro, who has been a revelation for Glory this season, is currently one of the favourites to take out this season's Johnny Warren Medal as the A-League's best player.

Glory chief executive Peter Filopoulos said Perth have already opened up negotiations with Castro.

Perth are also looking to add Socceroos defender Williams to their books, with the 27 year-old said to be eyeing off a move to the A-League after a horror injury run in the past few years.

While his career has stalled since suffering back-to-back Achilles tendon injuries, Williams returned to Perth recently for his grandfather's funeral.

But Glory coach Kenny Lowe said it was too early to start talking about the possibility of Williams joining the club.

Meanwhile, Risdon, who has captained the side nine times this season, is expected to be given the role full-time next season.

The speedy right-back is set to lead the side out again in Saturday night's clash with last-placed Central Coast Mariners at nib Stadium.

Glory will use the match to pay tribute to Australian under-23 striker Dylan Tombides, who died in 2014 of testicular cancer.

Supporters at Saturday's match can show their support for Tombides with a round of applause in the 38th minute, the same number as his jersey while with West Ham United.