Justin Gatlin is officially retired from competing, but that doesn't mean the USA track legend's done running ... in fact, the Olympic gold medalist is currently perfecting his 40-yard dash, and believes he can run a blistering 4.19 seconds!
"The project is Project 40. I ran a 4.2 yesterday, first day of practice," Gatlin told Michael Babcock on the "TMZ Sports" TV show (airs weekdays on FS1).
FYI, the fastest 40 ever electronically timed at the NFL Combine was 4.22 by John Ross in 2017. Chris Johnson holds the second-best time at 4.