The next two seasons were of mixed results, but the squad would remain competitive and be rewarded. The 2015–16 season was of mixed results in the A-League, but the squad would win the 2015 FFA Cup, and for the first time in the club's history, would progress to the round of sixteen in the Asian Champions League. Captain and marquee Mark Milligan departed the club during the preseason and was replaced by 2014 World Cup teammate Oliver Bozanic, with Carl Valeri given the captaincy role. Defender Thomas Deng would be promoted from the youth squad and feature occasionally throughout the season. Veterans Mathieu Delpierre and Archie Thompson retired at the season's conclusion and Deng would be loaned to Jong PSV, but the season would be mostly remembered for newly promoted captain Carl Valeri contracting a brain inflammation in December 2015, but would later return in the finals. The 2016–17 season saw an improvement in results in the A-League, with the squad finishing second on the ladder, and ultimately losing the grand final to premiers Sydney FC, making both clubs equal in premierships and championships. The season saw the returns of James Troisi and team of the decade winger Marco Rojas. Defender James Donachie joined from Brisbane Roar, and the club's youth squad would promote Christian Theoharous and Stefan Nigro.