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We ll keep up pace barrage: Lehmann
Shane Watson. Pic: Getty Images

Australia will use speed to crush England at the SCG but the identities of the pace merchants tasked with the artillery barrage will not be known for several more days.

While coach Darren Lehmann was sceptical that the aching Ryan Harris could back up for a fifth consecutive Test, he had no doubt what potential debutant Nathan Coulter-Nile or Doug Bollinger would offer if they were selected.

"They have both got wickets but the pleasing thing is the pace," Lehmann said.

"They've got some velocity which is a really big area for us in our bowling attack.

"Speed's a really big issue, especially in Australia where you need velocity on the ball as Mitch Johnson has shown."

Harris, Shane Watson and George Bailey are in doubt for Sydney. Lehmann suggested Australia may call up left-armer James Faulkner as an all-rounder and two spinners could be employed.

Harris has a deteriorating meniscus - the shock-absorbing cartilage that cushions the knee bones - and he contracted significant ankle pain during his 34-over load at the MCG.

He also suffered severe blisters after wearing new boots in the match and bowled only 10 overs in England's second innings.

"I would say (Harris) is doubtful but until we see the medical staff and see how he recovers, we will have to wait and see," Lehmann said.

"If he is not fit, he won't play. If he is fit, he will play."

Watson batted fluently in making 83 not out in Australia's run chase yesterday but he was limited to four overs after straining a groin muscle on the first day.

Lehmann said he preferred to have five bowlers in the team, meaning Watson's place could be in jeopardy if he could not contribute with the ball.

"He's an all-rounder, he has to bowl," Lehmann said.

"We will have to have a look at the Sydney wicket and assess all those situations and assess how he's going. If he's not right to do both then we have to look at that.

"I personally like five bowlers in the side because it's the best way to get 20 wickets.

"It's very hard for three quicks and a spinner to get the wickets you need every day, unless you had Shane Warne in your side who was a bowler and a half."

Bailey, who has scored 136 runs at 29.20, is the team's least convincing batsman and is the only member of the top seven to not score a century this series.

"George needs to make some runs," Lehmann said.

"The simple fact is our first innings batting hasn't been good enough. Even in Adelaide it was (Michael) Clarke and (Brad) Haddin who got that big partnership.

"We have to make sure we're improving our batting each and every time and we weren't good enough in the first innings here."