Brumbies coach Laurie Fisher is confident injured backline trio Gene Fairbanks, Stirling Mortlock and Matt Giteau will be fit and ready for Saturday night's Super 14 clash with the Highlanders at Canberra Stadium.

Fisher said Mortlock was almost certain to play, while Giteau, among six Brumbies backline players who didn't train on Monday, will be given until later in the week to prove his fitness.

Makeshift flyhalf Fairbanks is hoping to train on Tuesday after aggravating an existing low grade medial ligament tear.

"Stirling should be fine. He's carrying a bit of a shoulder injury but he has pulled up OK and we're very confident that he'll play," Fisher said.

"The report on Matt and Gene is good too. They didn't train today but they'll both do some running tomorrow and hopefully train with the team on Thursday."

Giteau has battled with bone bruising caused by repeated knocks above his right knee.

The star inside centre has worn padding on the bruised area during the past two matches to try and minimise contact on the injured area.

Fairbanks, who has been solid at five-eighth since taking over from the injured Stephen Larkham two weeks ago," said it was another critical game for the home side as they pushed to get closer to a semi-final berth.

"Things are going along well, the team's playing well and particularly our pack, which has made things easier for me at flyhalf," Fairbanks said.

"Having said that, we know that this is a vital game for us and any loss could be the end of our season so I'm desperate to get out there and play this weekend."

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