Aug. 22, 2018 4:12 PM PT5:12 PM MT6:12 PM CT7:12 PM ET23:12 GMT7:12 4:12 PM MST5:12 PM CST6:12 PM EST6:12 PM CT3:12 UAE (+1)19:12 ETNaN:� - Frederick says he has been diagnosed with a rare neurological disorder that causes weakness in various parts of the body and isn't sure on a timetable for his return. Frederick said in a statement issued by the team Wednesday that he has received two treatments for Guillain-Barre Syndrome over the past 48 hours and that the treatments will continue for several days. Analysis: The four-time Pro Bowl player says "doctors have told me that it is not possible to determine a timetable for a return to the field right now." According to the National Institute for Neurological Disorders and Stroke , Guillain-Barre causes the body to attack a network of nerves around the brain and spinal cord. The 27-year-old Frederick has started all 83 games, including three playoff games, since the Cowboys drafted him late in the first round in 2013.