Harrison (back) was cleared Sunday to resume a throwing, Anthony Andro of FOX Sports Southwest reports. The lefty, who is attempting to return from career-threatening spinal fusion surgery, will hold off for two more weeks before beginning the program. Harrison said his spine is about 85 percent fused at the moment, but if he proceeds cautiously with his rehab, the hope is his back will be fully healthy by early March. It's hardly a guarantee that everything will go according to plan for Harrison, whose health risk is further compounded by the fact that he's already had two previous surgeries on his back. The Rangers would probably be fortunate to get a handful of useful starts out of the 29-year-old in the second half of the 2015 season.