Luhrmann, his wife, and his two teenage children are in isolation, and plan to remain as such for 14 days.
Last Wednesday, Hanks and Wilson, both 63, sent shockwaves through the media when they revealed their diagnosis while visiting Australia for work where Hanks was meeting with a production company to discuss an upcoming Elvis Presley biopic.
The "Forrest Gump" actor was recently tested positive for the highly contagious virus along with his superstar wife Rita Wilson and has since then been in quarantine. British actor Idris Elba on Monday revealed he had tested positive.
"Panicking really isn't necessary and it's just making things more hard than they need to be", he said, calling out people for hoarding water and toilet paper.
The 29-year-old's video comes shortly after his dad posted an update from Down Under that showed him eating Australian staple, vegemite, on toast. "I know this is insane, but I'm just wishing everybody the best and we're going to get through this".
The ABC said that "Chet also took aim at people who were stockpiling food and other items, calling for calm".
He later followed up with another post, thanking "everyone here Down Under who are taking such good care of us". Some say he used way too much, others the flawless amount.
"We are taking it one-day-at-a-time".
Matthews' early symptoms included "sore throat, fatigue, headache", as well as a "mild fever", "shortness of breath" and a "deep, dry cough".