The Goodison chief has admitted he would prefer to see Cahill remain on Merseyside, with the game in Melbourne on February 6 sandwiched between this weekend's Premier League trip to Blackburn Rovers and the visit of Reading to Goodison a week later.
Moyes told evertonfc.com: "We said it would be better if Tim Cahill didn't go and we don't want to lose him at the minute but it's going to be Tim's decision."