DUBAI : Captain Michael Clarke said that Australia could regain the top spot, and added that it is unacceptable for his team to stay at such low rankings in cricket, pointing towards their third place ranking in Test cricket, fourth in one-day cricket and ninth in T20 cricket.  The Aussies begin their quest to regain the lead with the first-ever one-day match against Afghanistan in Sharjah on Saturday before three one-day and as many T20 internationals against Pakistan.