The former Ibrox player worked under the Celtic-linked manager at Brisbane Roar – scoring five times and landing the A-league Premiership and Championship double in 2010-11.
McKay believes the boss’ direct philosophy will entertain the fans with high-scoring matches – and be a hit with the players with his management style.
"Tactically, he's very good, he sets his team up well and brings in players who will do a job for him and will challenge everyone to be better.
"He's a great man-manager first and foremost which has shown with Brisbane Roar, the national team and now with Marinos."
The pair worked together in Queensland before McKay switched to Scotland for a season under Ally McCoist at Ibrox, but he only featured three times. Fellow countryman Craig Moore had a significantly more successful time at Ibrox and shares the belief that Postecoglou’s attacking entertaining football would be welcomed in the east end of Glasgow.
"The club needs a massive rebuild after what happened last season so he'll get in there and given time he will play an attacking style of football, possession-based but fairly direct as well.
"It's a case of if the opposition score six, he's happy with his team scoring seven - he's done that throughout his career.
"He's not scared to get out there and take it to teams.”