Captain Michael Clarke insisted Australia have set themselves a testing benchmark ahead of next year's tours of India and England, after romping to an innings and 201-run triumph over Sri Lanka on Friday.

The hosts needed less than three days to emerge victorious in the second Test at the Melbourne Cricket Ground, where a century from Clarke and an impressive performance from all-rounder Mitchell Johnson earned an unassailable two-nil lead in the three-match affair.

Clarke's 106 saw him become Australia's highest run-scorer in a calendar year, while Johnson's unbeaten 92 and match haul of six wickets earned the Man of the Match award.

"This is our standard now, we've got to continue to get better from here. I think we need to be realistic as well. It's about consistency. It's nice we've done it in the first two Tests against Sri Lanka and it's great we've won the series, but we have a lot of work to do as a team," said Clarke.

"I was really impressed with the way we kept Sri Lanka out of the match throughout the whole Test. That's something we will need to make a habit of going forward with some very important series coming up against firstly India and then the Ashes in England.

"I don't think you develop ruthlessness overnight, but our aim is to repeat our effort in the final Test and win the series three-nil. We've still got a lot of improvement to do as a team but it's a really positive step for this team to see that we are improving."

Defeated captain Mahela Jayawardene was left to rue a substandard showing compounded by injuries to wicketkeeper-batsman Prassana Jayawardene, batsman Kumar Sangakkara and seamer Welegedara.

Sangakkara and Welegedara have been ruled out of the final fixture at the Sydney Cricket Ground by respective hand and hamstring injuries. Jayawardene, who is nursing a thumb injury, remains in doubt.

"These are things that we can't control, but they are not excuses. Still with those guys playing we probably would have got beaten. So we just need to refocus our thoughts and come back strongly," added Jayawardene.

"We started the tour off pretty well in Hobart with the Test match but here we seemed to never get anything going for us. We just gave up, and that can't happen at this level, ever."