| Last updated
The American retired from MMA following his UFC bantamweight defence over Dominick Cruz at UFC 249, having captured two UFC titles in two separate weight classes during his glittering career.
GSP also recognised Cejudo as an Olympic gold medalist, a Golden Gloves winner and a clean athlete.
Speaking exclusively to SPORTbible, he said: "In terms of great fighters there's Anderson Silva, BJ Penn, Jon Jones and Henry Cejudo who retired just a few days ago.
"He's probably the best ever... he's an Olympic champion, a Golden Glove champion, a two-division UFC champion and he's a clean, clean athlete. He has done it all. Henry Cejudo is maybe the greatest of all time. It's a hell of a debate."
St-Pierre continued by revealing his Mount Rushmore of MMA greats, which includes UFC 1 winner Royce Gracie and martial arts philosopher Bruce Lee.
The ex-UFC welterweight champion added: "Royce Gracie for sure. He's the one who inspired me. Bruce Lee because he changed the sport in a philosophical way."
Chosen for YouChosen for You
Most Read StoriesMost Read