Chris Johnson's former teammate reflects on ex-star's surprise ALS diagnosis, tight-knit bond after milestone

The NFL world was stunned on Monday when it became public that Chris Johnson, one of just nine players ever to rush for 2,000 yards in a season, is suffering from ALS.

The news hit close to home for Ryan Fitzpatrick, who played for Johnson's Tennessee Titans for a season. And despite it being just one year, the two have a special connection.

"He was a great teammate when I got to play with him for the one year, and obviously a super talented guy on the football field. We texted about a year ago. I was just looking back at our text messages, and one of the things that I had sent him — the 100th touchdown pass that I threw in the NFL was to CJ2K, and he signed the football for me and gave it to me. It says, 'To my cool white boy. Congrats on number 100,'" Fitzpatrick recalled in an interview with Fox News Digital. "So the amount of street credit I have from Chris Johnson calling me a cool white boy has always been awesome to me."

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But ALS is just such a tough thing to have to deal with, obviously for Chris and for everybody around him. You can just imagine the frustrations of his mind being there but his body starting to fail him and how difficult that is. We're obviously all hoping for the best for him, and all our love and support goes to him and his wife and his family."

In a lengthy social media post, Johnson said that there is growing research that shows a link between repetitive head trauma and ALS, and studies have shown that NFL players are four times as likely to develop ALS as the general population.

Fitzpatrick, personally, said that when it comes to football, he would do it all over again, even as the risks are more prevalent now than ever before. However, what comes with age is more grim reality.

FORMER NFL STAR CHRIS JOHNSON SAYS HE'S BEEN DIAGNOSED WITH ALS

"I do think guys playing football understand at least the broad scope of what the risks are. I think a lot of guys would tell you, and I would be the same way, football has given me so much in my life that it's something I would do again in a heartbeat. And for my kids that want to pursue it, I'm happy for them to pursue it," Fitzpatrick said.

"But as you get older, I'm 43, as you get older, and your parents get older, I lost my mom five years ago, there's just more stuff that seems to happen. It's really sad. One of my best friends from high school was diagnosed with ALS. So seeing that firsthand, and the difficulties that come with it, not just for him but everybody that is around him, it's really hard. As you get older, stuff happens, and there are things that you have to deal with and figure out. So unfortunately, it's a tough part about aging."

There is no known cure for ALS – known as amyotrophic lateral sclerosis. It’s a progressive disease in which the brain loses connection with the muscles, according to the ALS Association. The afflicted slowly lose their ability to walk, talk, eat, dress, write, swallow and, eventually, breathe.

The former running back played in the NFL from 2008 to 2017 with the Titans, New York Jets and Arizona Cardinals.

Fox News’ Ryan Gaydos and Angelica Stabile contributed to this report.

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