Pakistan have one final chance to beat Australia tomorrow on what has been a woeful tour when the teams clash in a Twenty20 international at the MCG.

The tourists - the world champions in the shortest form of the game - have been whitewashed in both the Test and one-day international series and beset by internal problems.

But stand-in skipper Shoaib Malik - in charge following the two-match ban handed out to Shahid Afridi for ball-tampering - is determined his side will go out on a high.

"We have to win this game," he said.

"We are professionals and we are not [simply] looking forward to us going back to our country after 100 days. We're just concentrating on the match.

"The Test matches and one-dayers have finished now and we have just one Twenty20 (international) left so we have to put everything in this match, we'll 100% try to win this game."

Malik dismissed any concerns about security for his team in Melbourne, in front of what is expected to be a 70,000 plus crowd, after one of his players was tackled by a pitch invader in Perth.

"I think we've played enough international cricket in Australia to know that security's nothing [to be concerned about]," he said.

"Whatever happened in Perth was just a bit of an incident (and) they (Australian crowds) love and support cricket.

"Whoever's playing well they support them and I think that's all anybody wants from a crowd."

Malik's Australian counterpart Michael Clarke is also under pressure coming into the match with doubts surrounding his suitability to the T20 game.

While Clarke averages just over 50 in Test cricket and 42.65 in one-day internationals, in Twenty20 cricket he is averaging just 19.63 with a top score in 15 innings of just 37.

Former Australia batsman Mark Waugh believes Clarke should step down and pass the skipper's role on to Cameron White.

"I don't think (Clarke's batting) is suited all that well to Twenty20 cricket," Waugh told Fox Sports.

"With that back injury, I'm just thinking will it (playing Twenty20 matches) shorten his career? Cameron White could easily be captain."

There are others that say Clarke is too technically correct to be a valuable player in the unorthodox world of Twenty20 matches but on the eve of the clash against Pakistan, Clarke says he is ready to make his mark.

"He (Waugh) is not the only one to say it and everyone is entitled to their own opinion," Clarke said.

"I have been open and honest and said my performances in this form of the game have not been as good as I would have liked from the opportunities I have had."

But after spending most of his early Twenty20 career batting at either six or seven, Clarke says he will bat at number three against Pakistan in a bid to have more impact on the team.

However he has also vowed not to change his approach and believes it is possible to score heavily in Twenty20 matches without having to resort to slogging.

"For me it's about batting the way I (normally) play," he said.

"I have done that in Test and one-day cricket and I have got enough shots but it's about executing those shots and making sure I play the best I can possibly play.

"If I try and bat like somebody else, I know I will have no success.

"My strength is running between wickets so it's important I find the gaps.

"It's no sense me trying to hit every ball for six because that is now how I play my best cricket."