Wallabies skipper James Horwill ruled out of clash with Springboks at Suncorp Stadium THE late withdrawal of skipper James Horwill has rocked the Wallabies' chances for their must-win Test against South Africa at Brisbane's Suncorp Stadium on Saturday night. The influential lock twinged his hamstring at training at Ballymore on Tuesday. While not serious, precautionary scan results on Wednesday and his hamstring history made withdrawing the wise option. Halfback Will Genia will step up as skipper for the Test on his home ground. Kane Douglas will start at lock in Horwill's place while Ben McCalman is the new face on the bench. Horwill will miss Saturday night as well as the Test a week later against Argentina in Perth. Coach Ewen McKenzie discussed on Monday the changing status of powerful lock Sitaleki Timani, who had been overlooked for The Rugby Championship because he was heading to French club Montpellier. With the French deal reportedly stalled and Timani looking to stay in Australia next season, he becomes a real option to bolster the Wallabies skinny lock stocks again. McKenzie backed Genia to step up as Wallabies skipper. "Will is a proven leader and has had plenty of success as captain for the Queensland Reds and also for Australia," McKenzie said. It's extremely disappointing to lose James but after discussions with medical staff we felt it was important not to risk further injury when he isn't ready.