Coetzee developed the inflammation during the first Test in Centurion, and his discomfort got "progressively worse while bowling" in India's second innings, a Cricket South Africa release said. He was sent for scans on Friday, which revealed the extent of the injury. South Africa's Test coach Conrad Shukri opted to release Coetzee from the squad "as a precautionary measure," but there is no indication if he will be fit for the SA20, which starts on January 10.