Pakistan leg-spinner will miss Pakistan’s only warm-up contest in Australia prior to the three-Test series against the Kangaroos, ESPNcricinfo reported on Tuesday. The 30-year-old bowler hurt his back during a training session at Cazaly’s Stadium and is being treated.The leggie is tipped to be Pakistan’s main bowler for the upcoming series, starting Decemeber 15, due to the bouncy nature of the Australian wickets. In the absence of Yasir, Mohammad Nawaz remains to be the only specialist spinner available to Pakistan for the side match.Yasir became the joint second-fastest to 100 Test wickets in September. Since his debut in Test cricket against Australia in 2014, the leg-spinner has registered 116 scalps at an average of 28. The leggie sat out the Abu Dhabi Test against England last year due to a back spasm. There were media reports that Yasir felt stiffness in his back during the recent tour of England.