Travis Frederick announced he is suffering from Guillain-Barré syndrome, an autoimmune disease.

Frederick, a Pro Bowl center, was diagnosed with the disease after exhaustive tests conducted over the past few days. He has received treatments over the past 48 hours.

There is no timetable for Frederick to be cleared to play.

"I am feeling much better from an overall strength perspective," Frederick said in a statement Wednesday. "I will continue these treatments over the next few days. I am very optimistic about my condition and the immediate future, as I have been told that the illness was detected at a fairly early stage."