India's senior-most pacer Ishant Sharma was today ruled out of the Cricket World Cup owing to a knee injury. He was the only one among the four injured Indian cricketers who failed in the fitness test. The injured quartet of Ishant Sharma, Rohit Sharma, Bhuvneshwar Kumar and Ravindra Jadeja went through rigourous fitness drills in Adelaide and the lanky paceman was clearly not in best physical condition. A top BCCI source told PTI that Ishant has been ruled out and will not recover in time to play the World Cup. The souce said that as per regulations, Mohit Sharma, who was a stand-by, will be inducted into the World Cup squad. Ishant is likely to return home. The BCCI has, however, not yet issued any official statement on Ishant's withdrawal from the team and his replacement yet.