Brisbane Roar duo Shane Stefanutto and Jamie Young involved in heated argument after loss to City Roar duo Shane Stefanutto and Jamie Young come together after the loss to City. BRISBANE Roar's title defence has sensationally imploded, with ageing fullback Shane Stefanutto and goalkeeper Jamie Young involved in a heated argument after the champions on Saturday became the first team in A-League history to lose their first four matches of a season. It was all too much post-match for three-time championship Stefanutto, who took aim at Young, who continues to struggle while deputising for the injured Michael Theo, who will be missing for at least another month with a broken wrist. Match report: Roar the first side to start season with four losses Re-live City's win over Roar in our Match Centre It finally took Roar defender Jade North to defuse the situation, but the damage had been done, with rumoured tensions in dressing-room of the fading champions there for all to see. Coach Mulvey refused to comment on the specific incident, claiming he did not see it. However, Mulvey admitted frustrations were getting the better of the Roar, who are a shadow of the team that took all before them last season. "You've got to understand that players are going to be frustrated," he said. I thought we deserved something out of the game. What killed us was our defensive lapses as a team. We did not defend well as a team. We need to find some answers. We need to have a bit of a rethink, because clearly what we're doing is not bringing the results that we desire. You can't keep losing games of football ... we need to have a look of how we're doing everything top to bottom. In their first match since the departure of Spanish star David Villa, City took advantage of some schoolboy defending to strike twice early through former Roar striker David Williams and Mate Dugandzic and immediately heap pressure on the fading champions. City sealed their win in the 83rd minute through substitute Marc Marino, who scored his maiden A-League goal after getting on the end of a smart low cross from fellow replacement James Brown. City coach John van't Schip was reluctant to write off Brisbane despite the Roar's forgettable start to the season. "The philosophy and the vision they have, they will come out of this situation," van't Schip said. I won't say that we fear the Roar, but we respect them for what they've done in the last few years, we respect them because of the way the play ... but games are sometimes cruel. There are episodes in a game ... when you're playing good but you give away a game in two or three silly moments. That happened today to them, not taking away of course that I think we deserved the win with the way we opened the game up.