Under-fire Brisbane Roar have asked people to judge in 12 months rather than now whether their decision to show internationals Craig Moore and Charlie Miller the door was the right one.Roar coach Ange Postecoglou has moved swiftly to cover Moore's messy exit last week, parachuting in Belgian international defender Pieter Collen for the rest of the A-League season.Collen, 29, formerly played with Feyenoord and NAC Breda in the Dutch top flight.A central defender or right-back, he most recently played for Belgian second division side SK Beveren and has been capped twice for his country.Moore's move to Greek club AO Kavala, blamed by the Roar on a "him or me" ultimatum delivered to the club over Postecoglou's job, has sparked questions over how Brisbane are being run.But Postecoglou said he was confident Moore's, Miller's and goalkeeper Liam Reddy's departures would prove to be correct long-term decisions for a club attempting to rebuild in all areas after a disastrous season off-field."The players who have left have all left because of varying reasons they told me. We decided to let them go," Postecoglou said."I'm not really sure what people expected us to do - keep players who don't want to be here?"But I think as a club we're making decisions we feel are right."A lot of people are making decisions on the assessments I'm making right now, but I'm happy for the decisions to be judged 12 months down the track."Following two successive defeats, Postecoglou will slot Collen straight into the heart of Brisbane's defence for Saturday's clash with Newcastle at Suncorp Stadium.And Postecoglou has promised Collen won't be the last signing before the end of this season as the Roar remain hopeful of a finals spot."We're working on one, maybe two more signings before the end of the year and also announcing some signings for next year which are in an advanced stage at the moment," Postecoglou said."We wanted to send a pretty strong message that while some of the long-term decisions are in terms of rebuilding the squad ... we haven't given up on this year either."Collen has initially signed a three-month deal, with an option for both parties to extend should the move work well.The Belgian's last competitive match was just before Christmas, and he is confident he can provide the Roar with enough hard-edged experience to compensate for Moore's loss."I hope to do it better than him - I know he's a big-name and expectations are high," Collen said."But it's up to me to fulfill those expectations."