Eric Dane opened up about his recent ALS diagnosis on "Good Morning America," telling Diane Sawyer that he now only has "one functioning arm."

Former "Grey's Anatomy" star Eric Dane is speaking out for the first time in a television interview about his battle with ALS, a degenerative neurological disorder.

I’m fighting as much as I can," says the actor, who is concerned he will lose control of his left arm in the coming months but remains committed to acting while he still can