Steve Smith wants Nathan Lyon to be more consistent and says there are no guarantees that the spinner will keep his place in the Australia side for the third Test against Pakistan.
Lyon endured a torrid first innings of the Boxing Day Test, taking just one wicket for 115 runs from his 23 overs as the tourists posted 443-9 declared.
There was talk of the experienced off-spinner being left out of for the opening Test in Brisbane, but it was Chadd Sayers who missed out.
However, Australia captain Smith was unable to confirm that Lyon will stay in the team for the final game of the series.
"I'm not sure. That's up to the selectors," Smith said when asked if Lyon will play in Sydney next week.
"He obviously hasn't bowled at his best in this game. It's always difficult bowling to lots of right-handers.
"And they [Pakistan] play spin pretty well. It's never easy bowling against subcontinent players when the ball isn't doing a lot off the wicket as well.
"I guess we're just looking for Nathan to be a little bit more consistent in the way he bowls."
Smith also said it is likely that another spinner will be included in the squad for the match at the SCG.
"I think it's possible that we could see another spinner in Sydney," said the prolific batsman.
"It's been spinning quite a lot there in [Sheffield] Shield cricket this season so there's a good chance there'd be a spinner added.
"[The pacemen] have done some bowling and it's obviously been a pretty big summer for them as well. Six Tests matches is always a lot.
"They've done some yards, which is a little concerning but I think they're pretty confident in their bodies that everything is going okay.
"We had Hilton [Cartwright] in here as cover for those quicks who had a big workload last week and they were confident they could get through and get the job done. It's going to be about summing it up and seeing where they're at come the end of this Test match."
Smith brought up his 17th Test century to leave Australia 465-5 - leading by 22 - when rain brought day four of the second Test at the MCG to a premature end.
Australia lead the series 1-0 after winning the first Test by 39 runs.