Randy Moss is stepping away from his role on "Sunday NFL Countdown" ... to focus on his battle with an undisclosed health issue.
ESPN announced the move Friday morning ... explaining the Hall of Famer will be gone for "an extended time" as he continues to deal with "a personal health challenge."
Moss first made his fans aware of the medical ailment on Dec. 1 ... though he kept things vague, saying merely he's "battling something internal."
Moss revealed he would need to wear sunglasses on ESPN's set while dealing with the matter.