What is the fine-grained topic of the following text: Goalkeeper Brad Jones, defender James Meredith, and attacker Jamie Maclaren are among the capped Caltex Socceroos players to be included in van Marwijk’s preliminary squad, while uncapped 22-year-old defender Aleksandar Susnjar could receive his first senior international call-up. Only return the topic.
Selection of players for van Marwijk's preliminary Caltex Socceroos squad.