Worrying news coming in for Indian cricket fans. According to reports Yuvraj Singh's illness is far more serious than it was originally thought to be. According to reports Yuvi is undergoing chemotherapy in the United States. Yuvraj has been out of action for the last few months after he was diagnosed with a non-malignant golf ball sized tumor in his lung. The family however has refused to confirm reports on whether Yuvi is indeed undergoing chemotherapy. The Sahara press release had also suggested that the all-rounder had a critical illness. Some reports suggest that Yuvi may have overworked at the NCA in a bid to make a quick return, resulting in the illness taking a more serious turn.