Calvin Johnson shockingly decided to retire earlier this offseason at the age of 30. A Hall of Fame-caliber player for nine years, Johnson finished his career with 731 catches for 11,619 yards and 83 touchdowns. Those figures rank 43rd, 27th, and 22nd all-time, respectively, and they rank fifth, third, and fifth through nine seasons.

Considering he finished 2015 with 88 catches for 1,214 yards and nine touchdowns, he sure looked like he had a whole lot of football left in him.

Just don't expect to see him on the field ever again. Reached by the Detroit Free Press at his football camp, Johnson definitely shot down speculation that he'll be making a comeback any time soon, or ever.

Calvin Johnson has left his playing days behind. USATSI

Asked if he was content with his decision to retire, Johnson replied, "Yeah. Yeah. My decision. I made my own decision. I feel good."

"So you're not coming back," he was asked for clarification.

"I'm not coming back," the receiver known as Megatron said. "You ain't gotta worry about that."

Johnson then addressed all the speculation about him possibly heading to New England or Miami.

"I go different places," he said. "Somebody see me in the airport and they assume that I'm coming to visit Boston or I'm coming to visit Miami or something like that. It doesn't work like that."

As for why he left the game at such a young age, Johnson said that multiple things played into the decision.

"You don't see what they do on and off the field. So there's a lot of factors that play into guys, how long they play and everything like that. Sometimes it's mind, but your body can only do so much," he said. "It's just a time where you are content with what you did, and I'm content with what I did."