Bosnich made his A-League debut with the Central Coast Mariners on 31 August 2008 in a 4–2 away win against the Queensland Roar at the Suncorp Stadium in Brisbane. Once Mariners first-choice goalkeeper Danny Vukovic had served his suspension, Bosnich did not play again for the Mariners. On 31 May 2009, it was announced that Bosnich had signed to play for Sydney Olympic for the remainder of the NSW Premier League season.
Bosnich made his A-League d,ebut with the Central Coast Mariners on 31 August 2008 in a 4–2 away win against the. Queensland Roar at the Suncorp Stadium in Brisbane. Once Mariners first-choice goalkeeper Danny Vukovic had served his suspension Bosnich did not pl,ay again for the Mariners. On 31 May 2009 it was announced that Bosnich had signed to play for Sydney Olympic for the remainder of the NSW Premier League season