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Jared Payne expects to face an "angry" South Africa side in Saturday's Second Test in Johannesburg.
Payne, who started for Ireland at full-back for the first time in Saturday's 26-20 victory over the Springboks in Cape Town, expects a strong response from Allister Coetzee's side.
"The Boks will be coming back angry at Ellis Park," he said.
"It’ll be tough with those big boys charging at you. It will be different at Ellis Park than Cape Town. They’ll have had another week together and it should be a step up again."
Ireland clung on for a first-ever victory over the Springboks on South African soil despite playing 57 minutes with 14 men following the early red card for flanker CJ Stander.
And Payne says Ireland will need to show equal amounts of mental fortitude in Saturday's Second Test against a highly-motivated South Africa side.
"We need to improve massively not only physically, we’re going to have to go to a darker place again mentally. We’re going to have to be more on the ball," the New Zealand-born Ulster back continued.
“We’ve identified areas that we can improve on and it’s both mental and physical, so if we can do that and raise our game then hopefully we can meet the level that the Boks will be at. Because I guarantee you, they’ll be a lot better as well."
Ireland number eight Jamie Heaslip, who played and won at Ellis Park as a British and Irish Lions in 2009, expects the stadium to be "a cauldron" but says the squad's experience in European club rugby will help their preparations.
"At European level it’s up there, it’s not too far off international rugby - in those Christmas back-to-back games, one team can run away with it one week and then the following week it’s a completely different side," he said.
"The team that got beaten comes flying back.
"Even in tight games where one game might be tight the first week, the next game is blown wide open.
"So, when you play these internationals back-to-back, with all the analysis that goes in and the knowledge that players have of other players of what attacking and defensive coaches of both sides are learning from that first game coming into the second game, it poses all sorts of different challenges."