Kingston: Jamaican sprint superstar Usain Bolt has injured himself at the national Olympic trials and risked losing his 200 metres spot on the team. The multiple World and Olympic champion said he felt discomfort in his hamstring in the first round of the 100m and then again in the semi-final on Friday, reports Xinhua. "I was examined by the chief doctor of the National Championships and diagnosed with a Grade 1 tear. I have submitted a medical exemption to be excused from the 100m final and the remainder of the National Championships," Bolt said in a statement. However, Garth Gayle, the general secretary for the Jamaican Athletics Administration Association, said Friday night that unless Bolt shows up for his 200m heat on Saturday he could lose that place on the Olympic team. Bolt is looking to win his third consecutive Olympic titles in the 100m, 200m and 4x100m relay at the Rio Olympics which kicks off on August 5.