Despite being knocked out after just 40 seconds of the first Test in Brisbane, Lealiifano made the Wallabies number 12 jersey his own during the series.
And he reckons he can use the experience gained against the Lions in the Brumbies Super Rugby qualifier against the Cheetahs on Sunday.
"Playing at Test level really helped me just with peace of mind, knowing that I can cope at that kind of level, so it definitely gives me a little bit of help going into finals footy on Sunday," said Lealiifano.
"It was very exciting to be a part of the whole thing and coming back (to the Brumbies) now I'm just trying to bring a bit of that experience and knowledge back."
The Brumbies crashed to a shock 21-15 loss to Western Force in Perth last weekend.
But they have fallen to back-to-back defeats just twice under Jake White and the Wallabies ace is confident his side can get back to winning ways.
"This group definitely bounces back from a loss so we're looking to do that on Sunday and play some good footy," he said.
"We're not satisfied with how we are at the moment and hopefully we can bounce back.
"We're hoping that everything just clicks for us, we've worked too hard for it not to.
"We're obviously very disappointed about last Saturday but we're just going to put everything in towards Sunday and hopefully everything does pay off for us."
And both Lealiifano and his Brumbies teammates, who inflicted a 14-12 defeat on the Lions, are well aware of the importance of the clash as the club target the finals for the first time in nine years.
"There's been a fair bit of talk about how big the occasion is and I guess it's nine years since the Brumbies have been in the finals but for us we've just got to approach it like any other game," added the centre.
"We're happy we're in this position and we've worked too hard to let it slip so we're really going to enjoy it and be excited about it."