Australia could change the bowling attack which won it five Test cricket series this year to reunite legspinners Shane Warne and Stuart MacGill in Sunday's third Test against Pakistan in Sydney.

MacGill and Queensland allrounder Shane Watson were added to the side which beat Pakistan by nine wickets at the MCG on Wednesday, with cricket-starved Brett Lee relieved of 12th man duties so he can play this weekend.

The squad will be trimmed from 13 to 12, probably on New Year's Day.

Out-of-sorts batsman Darren Lehmann was retained, and would be the obvious omission if selectors drop a batsman.

But one theory has both fast bowler Michael Kasprowicz and Lehmann missing out and being replaced by MacGill and Watson, who would bat at No.7 and bowl seamers in his debut Test.

Chairman of selectors Trevor Hohns admitted Lehmann's form was a worry, after just 249 runs in his past 10 innings, but not significant to warrant a change.

He said the most likely way MacGill would play his first Test since the tour of Sri Lanka in March - when he last bowled in tandem with Warne - would be at the expense of a fast bowler.

"That would be the way we'd go most likely, to play two spinners and two fast bowlers," Hohns said.

"It's a conditional selection - we've got 13 guys there so we've got a few options and what we've seen this year is that it's a normal, SCG turning pitch."

Australia has played two spinners in four of the past five Sydney Tests, although batsman Simon Katich was the second legspinner in both matches there last summer.

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