The ACT Brumbies' charge to the semi-finals has paved the way for Lealiifano to become just the second player in the club's history to reach the 150 game milestone.

It's a fitting parting gift for a player who has given 12 years of service to the team and a first-half blitz might be the secret to ensuring his farewell tour extends to the grand final next week.

The Brumbies have scored more first-half tries than any team in Super Rugby this year, crossing the line 42 times in the opening 40 minutes of matches. Their opponents this week, the Jaguares, have scored 27 first-half tries this season.

The statistics, provided by Opta, prove the Brumbies have been entertainers this year despite early-season criticism of their style and reliance on the rolling maul.

The Brumbies proved their doubters wrong last week, scoring their first try after just 56 seconds and having their hulking forwards ease the pressure on Lealiifano by showing their newfound playmaker skills.

Brumbies coaches have challenged the likes of 208 centimetre lock Rory Arnold and 116 kilogram prop to add deception to their power this season to help spark an attacking revival.

Arnold and Sio both threw superb inside passes that led to tries in a quarter-final win in Canberra last week. The blueprint has been copying the Canterbury Crusaders' "simple plan".

"I think we've got our whole game in order. I think everything can improve, but we understand how we want to attack," said defence coach Laurie Fisher.

BRUMBIES NEWS

"Once you're comfortable with your game, guys just have to do their job. That's all the Crusaders do, they do their job and they do it really well.

"That's what we're trying to do. You're not looking for any one person to win you the game. Some guys will do great things because they're great footballers. But everyone has a job and if you focus on that, the rest looks after itself.

"Moments of brilliance will happen ... we've had a lot of conversations with guys like Rory. He runs hard, but he's easy to defend because he doesn't shift the ball.

"So we've been saying to him to throw the pass. He did that [last week] and I'm so happy for him."

Departing captain Lealiifano would have finished his Brumbies career on 149 games if the side was knocked out of the finals last week.

Beating the Sharks means he will reach game No. 150 against the Jaguares in Buenos Aires, joining Ben Alexander as the only players to pass the 150 mark.

Lealiifano's milestone is made even more impressive given he has effectively missed two entire seasons after a horrific ankle injury in 2012 and being diagnosed with leukaemia in 2016.

"The big thing for the boys is just enjoying our footy, enjoy it when it's tough because when you come out the other side with a nice victory, it's even sweeter," Leaiifano said.

"The amount of support I've had and messages has been really, really special. It makes me feel like I've had an impact here and I'm really humbled by that. I love this team, I love this city and it will always be really, really special to me."

The Brumbies arrived in Buenos Aires on Monday (Australian time) and will have minimal training time before playing in the semi-final. Coach Dan McKellar will make at least one change to his starting XV after injury ruled out Pete Samu.

The Brumbies will advance to the grand final for the first time since 2013 if they win and they could host the decider if the Hurricanes beat the Crusaders.

SUPER RUGBY SEMI-FINAL

Saturday: Argentina Jaguares v ACT Brumbies at Jose Amalfitani Stadium, Buenos Aires, 9.05am (AEST).