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Sri Lanka's tough decisions for the Sydney Test aren't limited to picking a fit team.

Captain Mahela Jayawardene admits he might expose his fragile top order if he wins the toss to give star spinner Rangana Herath a chance to bowl late on a wearing SCG wicket.

The Sri Lankan batting line-up has crumbled in Australia - rolled for scores of 156 and 103 in Melbourne after struggling early in both innings in Hobart.

But such is the desperation to give Herath an opportunity to bowl last on a wicket expected to suit slow bowlers by day five, Jayawardene knows he might need to tell his top order to face Australia's four-pronged pace attack front on.

The Sydney wicket is no green monster but curator Tom Parker compared it to the deck offered up last summer - on which India were rolled for 191 as pace trio James Pattinson, Peter Siddle and Ben Hilfenhaus claimed all the wickets.

This time around, Australia have one-upped that attack by going with four quicks against Sri Lanka - Siddle, Mitchell Johnson, Mitchell Starc and impressive newcomer Jackson Bird.

Parker said the wicket promises some early assistance for seam bowlers especially if, as expected, cloud coverage hangs around.

But Parker insists it is still a bat-first wicket, and Jayawardene might have to reluctantly agree.

"That's something that I'll have to weigh," Jayawardene said.

"The best way that we could win a Test match would be to try and create a situation for Rangana on a slow turner.

"So we just have to make sure that till the fourth or fifth day, we execute a good game plan and stay in the game.

"Those are things we will discuss after we have a look at the wicket and once we finalise our team."

Parker said while the wicket had a green tinge now, he expected it to revert to a typical Sydney pitch later in the Test when it will favour the slow bowlers.

"(Batting first) goes with conditions of the day but usually you bat first," he told reporters.

"And the nature of (the) SCG, as it goes on, you don't want to be batting last if it went five days on day five. I think it will turn."