November 2013, O'Sullivan was named Assistant Coach for the Central Coast Mariners on a contract until the end of the 2014–15 A-League season, working alongside newly appointed coach Phil Moss. Following the immediate departure of Central Coast Mariner's Head Coach Paul Okon, O'Sullivan was named as the caretaker coach until the end of the 2017–18 A-League season. On Thursday, 16 My 2019, O'Sullivan was appointed as new coach for the remainder of the 2019 National Premier Leagues NSW 2 season with the Bonnyrigg White Eagles FC. To begin the 2019 CAS Football season, O'Sullivan was appointed Head Coach of the Barker College 1st XI, leading them to the title. Managerial statistics Honours Club Swindon Town Football League Second Division: 1992–93 Central Coast Mariners A-League Pre-Season Challenge Cup: 2005 Individual Plymouth Argyle F.C. Player of the Year: 2000–01 External links Swindown Town FC A-league Profile Cardiff City FC References 1974 births Living people Republic of Ireland association footballers A-League Men players National Soccer League (Australia) players Republic of Ireland under-21 international footballers Cardiff City F.C. players Central Coast Mariners FC players Exeter City F.C. players Northern Spirit FC players Parramatta Power players Plymouth Argyle F.C. players Swindon Town F.C. players Geylang International FC players Lake Macquarie City FC players Central Coast Mariners FC non-playing staff Expatriate footballers in Singapore Singapore Premier League players Association football midfielders Bonnyrigg White Eagles FC managers Republic of Ireland football managers