Moore has praised his former Roar teammate, saying he has all the attributes to become a Socceroos regular, but just needs to improve his goalscoring record, which currently stands at 16 in 107 A-League matches.
"If he could add goals to his game, I'm pretty sure he'd already be away from Australia," Moore told the Courier-Mail.
"He's got the workrate, he's got the technique, he's got the engine, but as an attacking midfielder he'd like to get on the scoresheet a lot more than he does."
And Moore, a former Socceroos veteran, added that the Roar would want to work hard on keeping McKay at the club before he ships off to try his luck elsewhere.
"They would still be keen to keep him but he's an ambitious boy and I'm sure in the back of his mind he's hoping to have the opportunity to play at a higher level overseas and also earn some better money," he added.