Moore, who is only 16, has not looked out of place when training with much senior colleagues.
"We've done that all year. We've had guys at different times from our academy and the Under-21s training with us for extended periods rather than just bringing them up for a day or two," Postecoglou told his pre-match press conference.
"Mikey has been really good. Look he's a very talented boy and for him, he's had a fairly disrupted season, he's had a couple of injuries. When he's performed, he's performed really well. The reports I've had on him have always been outstanding. It's been good to have him.
"Obviously we've had a couple of weeks without a game and it's been good to get him involved in the first team. Again, to be fair to him he has adapted really well, he hasn't looked out of place and it's great for him. Hopefully it gives encouragement to him and some of the other guys who are coming through."