Ange Postecoglou hails Victory depth as he unveils marquee player Pablo Contreras New Melbourne Victory marquee signing Pablo Contreras with son Vicente as he trains with his teammates for the first time. Picture: Andrew Tauber Source: News Limited Ange Postecoglou hailed Melbourne Victory's depth after unveiling marquee player Pablo Contreras and confirming fringe Socceroo James Troisi had joined the club on loan. Postecoglou said both will be available for the round 1 derby, as well Archie Thompson who was overlooked for the Socceroos squad to play France and Canada although Mark Milligan was picked. Victory negotiated a free release for Contreras, who had a year to run on his Olympiakos contract but did a full preseason with the club. Postecoglou said Contreras' arrival was a message for the whole group, not just former captain Adrian Leijer. ``No-one needs to be comfortable or complacent. We want to be the best in the country, you don't win championships by giving anyone protected status, everyone needs to be challenged," he said. Pablo Contreras gets down to business after receiving his Melbourne Victory guernsey. It was pretty specific what we were looking for and Pablo fit the bill. We needed a quality player but also somebody who could give us some real leadership. Defensively we were a little light on and it was probably our Achilles heel last year in that we didn't have a lot of depth and when we lost Adama (Traore) we really struggled in a defensive sense. Contreras, who retired from senior national team a year ago after 12 years and 67 caps, said Australia holds happy memories for him after Chile won the Bronze Medal at the 2000 Olympics. "I stayed one month in Melbourne and one week in Sydney, I have in my memory this moment because it was history for my country," Contreras said. I hope I can help the team and hope we can win the championship. I know (Melbourne) is the most popular team in Australia so I'd like to thank them for this wonderful opportunity.