Former Tennesse Titans linebacker Tim Shaw has been diagnosed with ALS.

Shaw, 30 posted a video on the Titans' website making the announcement.

"I'm Tim Shaw," Shaw said in the video. "A year ago I was playing NFL football. I have recently been diagnosed with ALS. I am here today to stand up and fight with all of you against this disease.

"I want to challenge the Tennessee Titans organization, coach James Franklin and the Penn State football team, and my Clarenceville (Michigan) community. Let's do this."

Shaw was a special-teams ace with the Carolina Panthers, Jacksonville Jaguars, Chicago Bears and the Titans.

Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease that affects nerve cells in the brain and spinal cord.

There is no known cure.

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Aaron Wilson covers the Ravens for The Baltimore Sun