hosted Brisbane Roar, losing 1–0. The match was Adelaide's first home loss and first match without scoring in the season. United rebounded on New Year's Eve, hosting Sydney FC and winning 3–0. Vidosic scored a brace with Ramsay netting the final goal. United followed this with a 0–0 draw in hot, dry conditions at Newcastle. On 11 January 2013, Adelaide United hosted Perth Glory. Some tension had been brewing between supporters and stadium security, as well as with the club itself. Both supporter groups staged a silent protest, with the issue being given significant media attention on internet and radio, citing disconnect with the club and heavy-handedness by security staff. At the conclusion of the protest, the stadium erupted to rapturous applause. Adelaide went on to defeat Perth 3–2. Adelaide United lost its next three matches. Firstly was a 2–0 loss away to Melbourne Heart, and subsequently a 3–1 loss away to Central Coast Mariners (despite, again, gaining the lead before half-time). John Kosmina had expressed his desire to the club for a two-year extension to his contract, and rumours publicly emerged of assistant coach Michael Valkanis being offered a contract extension, but not Kosmina. Kosmina resigned as head coach shortly thereafter. Valkanis was appointed as interim coach until the end of the season, with former Adelaide City FC player Sergio Melta being appointed as his assistant. Valkanis' first match in charge saw Adelaide lose 2–4 at home to Western Sydney, but a week later delivered a resounding 1–0 win over Melbourne Victory, Jeronimo Neumann once more the lone goalscorer. The triumph ended Victory's run of form, who subsequently struggled for positive results for the remainder of the season. Unleash Solar collapsed and went into administration, eventually dissolving. This left the club with no front-of-shirt sponsor. Adelaide announced the signing of Tomi Jurić on a short-term deal until the conclusion of the season. Adelaide won just one of its remaining matches, a 2–0 away win over Melbourne Heart. Finishing the season in fourth place, United hosted Brisbane Roar in an elimination final, but lost 1–2, thereby ending Adelaide's season. Season overview It was announced on 1 December 2011 that as part of the AFC Champions League review conducted earlier in the year, Australia would be granted an extra play-off slot for the 2012 edition of the competition. Adelaide United placed 3rd in the 2010–11 A-League season and thus gained entry