Warren Gatland’s men came off second best last weekend in Cape Town as the Springboks left proceedings tantalisingly poised at 1-1 after a resounding 27-9 success.
Lions head coach Gatland has reacted by making six changes to his starting XV for the forthcoming winner-takes-all clash.
Wales hooker Owens will make a first Test start in a Lions jersey.
The incoming Scarlets front-rower insists belief remains high in the camp and feels a few “easy fixes” could be sufficient to secure a famous victory over the current world champions.
“You’d probably say the momentum is with South Africa with the way the last game went, but we can’t look back at what happened last week,” Owens said.
“The confidence is still there. We know and trust our processes and what we’re trying to achieve and we’re here for a huge third Test series decider.
“We’re in a really good place and we know the challenge that’s going to be coming from South Africa so it all bodes well for a great finale.
“We’ve got the blueprint for the win.
“We’ve just got to take confidence from what we’ve done well on tour.
”We’ve won a Test match, lost a Test match, so it’s all to play for in the third and a lot of the things are easy fixes.”
The British & Irish Lions in training ahead of facing South Africa this weekend. Credit: INPHO
We’ve just got to take confidence from what we’ve done well on tour. We’ve won a Test match, lost a Test match, so it’s all to play for in the third and a lot of the things are easy fixes
Owens came off the bench for the second successive match last Saturday but was powerless to prevent the hosts turning a narrow half-time deficit into an emphatic win.
Gatland’s alterations for the third Test also include Owens’ fellow Welshmen Liam Williams, Josh Adams and Wyn Jones who start at full-back, wing and loosehead prop respectively.
Dan Biggar and captain Alun Wyn Jones are also in the side with Adam Beard on the bench.
The Lions know they need to get the better of South Africa both physically and in the aerial battle if they are to come out on top and seal a series win.
Owens described that as a “massive challenge” ahead of one of the most significant games of his career.
“It’s my first start in a Test series for the Lions which I am hugely proud of,” said the 34-year-old, who was also part of Gatland’s Wales team narrowly beaten by South Africa in the semi-finals of the 2019 World Cup.
“It’s a third-Test decider against the world champions so it’s right up there as one of the biggest games, but definitely my biggest in a Lions shirt.
“We know exactly the challenge South Africa bring. They do pride themselves on it. They try to impose themselves physically.
“It is a massive challenge, but we knew that before coming down here. We took a bit of a hit with it last week and probably came second best.
“But I think we’ve been very physical on this tour ourselves so it’s going to be a phenomenal Test match.
“Warren has been pretty calm. He just knows how to get the best out of the players.
“He steps in and prompts boys when he needs to.
“He’s been at his best with that this week. That huge experience he’s got is right around the place at the moment.”
