Ryan Harris ignores orders to help a Queensland side decimated by a stomach virus in Sheffield Shield Ryan Harris will ignore orders and continue to bowl for the Bulls. Picture: Sang Tan. RYAN Harris will ignore orders and bump up his bowling workload - desperate for Ashes match conditioning and to help a Queensland side decimated by a stomach virus against South Australia in Adelaide. Harris resisted national coach Darren Lehmann's instruction to sit out the Sheffield Shield opener at Glenelg Oval in Adelaide and wants to bowl more than the 12 overs permitted against the Redbacks. Test spearhead Harris is still on the comeback trail from the hamstring he injured in the final Ashes Test at the Oval but impressed with 1/27 from 15 overs on Wednesday. It is fine, I got through 15 overs. I felt ok the first spell, not so good in the second but then the old ball I felt good. I got tight in the hammys but then I loosen up and it goes away," he said. I wasn't trying to bowl too fast out there but I felt good out there. Harris is crucial to Australia's chances of regaining the Ashes with James Pattinson, Mitchell Starc and Pat Cummins all injured. Harris concedes he's a series to series proposition but says the more he bowls the better he feels. Boof didn't want me to play but I wanted to. He needs me ready and feeling good for the first Test. The Bulls lost skipper James Hopes, keeper Chris Hartley, batsman Greg Moller and speedster Ben Cutting to gastro with Redbacks No.4 Tom Cooper capitalising with a timely, unbeaten ton (165). "I have never experienced a game like it losing four blokes.The boys stuck at it," said Harris. Cooper was brilliant in striking his third first-class ton as SA (4/294) took control of the historic Shield clash at Glenelg. Unbeaten pair Cooper and skipper Johan Botha (59) were united at 4/101 following the loss of debutant Kelvin Smith (1) but struck a 193-run, fifth wicket stand full of aggressive but controlled strokeplay. Cooper made more runs than he did across all forms for the Redbacks in a poor 2012-13 summer and was determined to cash in, crunching six sixes. It just made more determined to go big if I did get in and things went to plan. You have to positive and Boats came out and batted really well. It was really satisfying," said Cooper.