Durban-based outfit Sharks and Springboks second-row Eben Etzebeth faces a significant injury concern after leaving the field during their 23-13 victory over Edinburgh. Etzebeth played the first half of the United Rugby Championship match but did not return after half-time due to a rib injury. Sharks head coach John Plumtree is uncertain about the severity of the injury and expects to be without Etzebeth for the upcoming Challenge Cup round-of-16 clash against Zebre Parma. Despite various challenges, Sharks managed to secure their second consecutive win but Plumtree believes there is room for improvement in their performance.