A worrying knee injury to James Ryan has further complicated the All Blacks' locking problems. Ryan was forced off after just six minutes of the Highlanders' 34-38 loss to the Chiefs in their thrilling Rebel Sport Super 14 match in Queenstown on Saturday afternoon. He was involved in an early attack by the Highlanders and appeared to twist his left knee awkwardly. The medical staff confirmed that Ryan had done medial ligament damage which will place a question mark over his future in the championship. The All Blacks aren't short on options with the Blues having three form locks in Ali Williams, Troy Flavell and Greg Rawlinson and Jason Eaton getting back into action for the Hurricanes. But the loss of senior lock Jack and promising youngster Ryan are problems they could do without. The injury problems didn't end there with the Chiefs losing promising young centre Richard Kahui to his third shoulder injury of the year. And the Highlanders lost in-form halfback Jimmy Cowan (hamstring) and fellow All Blacks Craig Newby (thigh) and Clarke Dermody (knee).