Ex-WWE stars Big Cass and Enzo knew Ric Flair would come through after his medical emergency earlier this month ... telling TMZ Sports Ric is too much of an "indestructible" beast to die!!!
"He is immortal," Enzo says.
We broke the story ... Ric was rushed to the hospital on May 16 after the 70-year-old legend suffered a "very serious" health scare.
But, Flair -- as always -- was able to pull through ... and he even wore a t-shirt with his mug on it as he exited the hospital!