It will be the 20 year old's second loan spell of the season. His previous one was at Cheltenham.
He goes to Aldershot until the end of the year.
Dillon said: "He is someone I know extremely well from my time at Reading and I know all about his character.
"He has been selected for the Australia squad in the past and is a dead-ball specialist.
"We have few injuries at the minute but I wanted to bring in a couple of players to add strength to the squad."