Aussie Rules Star Nic Naitanui Warns NBA, Bubble Life Takes Mental Health Toll

Nic Naitanui -- Aussie Rules football's biggest star -- successfully completed 5 weeks in a bubble environment Down Under ... but cautions the mental health side of things is a real concern for athletes.

FYI, the Australian Football League (AFL) is currently running a hub system -- where teams are quarantined in separate bubble environments throughout the country.

Entry into each bubble requires 2 weeks of quarantine followed by strict testing -- and then it's off to a secure site, which in Nic's case was a Top Flight hotel.

The West Coast Eagles star admits it was "pretty tough" to adjust at first -- but he got into a routine and ultimately played really well on the field.

Now, Nic says sports leagues from all over the world have been contacting the AFL and the individual teams for advice on how to successfully pull off a bubble ... and he's got some solid tips.

The biggest warning, per Nic, is mental health for the players.

"The mental health side of things is massive because you are deprived of that social interaction with your family and friends and what not."

"I can tell why people probably do sneak out of the bubble. I see with the NBA boys because they're used to having that freedom and livelihood to do what they want and now you're being told -- its almost like a prison, albeit, a 5 star prison!"

The big question for us ... will the NFL follow the AFL's lead before time runs out?

The NBA, like the AFL, is having tremendous success so far in their bubble.