Colin Kaepernick ain't on an NFL roster, but he'll be taking the field against the Texans this Sunday ... courtesy of Tennessee Titans star Rishard Matthews' cleats!!
The 28-year-old receiver revealed his custom kicks for the NFL's "My Cause, My Cleats" campaign this weekend ... which allows players to wear any creative design supporting a charity of their choice on their cleats during the game.
Matthews explained his decision to support Kaep's Know Your Rights Camp ... saying "I don't have a foundation so I have chosen to support my brother (Colin Kaepernick's) foundation."
"He has paid the ultimate sacrifice in order to bring true everyday issues to light."