Bad news, Raiders fans ... Justin Gatlin says he suffered a similar cryotherapy injury as star receiver Antonio Brown -- and the U.S. sprinter says it took him MONTHS to get healthy.
The superstar Olympian famously got frostbite on both his feet and ankles after a mishap in the cryogenic chamber back in 2011 -- and the guy says the injury hurt like hell.
In fact, when Gatlin joined "TMZ Sports" (weeknights on FS1) on Wednesday, he said of the frostbite, "It was a disaster. I had, like, boils and blisters all over my ankles.