SYDNEY : Australia coach Holger Osieck on Wednesday warned misfiring stars Harry Kewell and Brett Emerton they would have to improve their performances to stand a chance of playing in upcoming World Cup qualifiers.The former Premiership veterans return to the Socceroos squad after being overlooked for recent home games against Malaysia and Oman as they prepared for their first matches in the domestic A-League, after long stints overseas.Osieck left them out for last month’s internationals to give them time to build up match fitness, and he warned they needed to prove themselves capable of more than he had seen so far in the local season.“There’s no guarantee (they’ll play) at all, I’m pretty much performance-related,” Osieck told reporters after unveiling his 23-man squad.“I ask a lot more of them other than they have produced so far.
