Ireland full-back Kearney is set to make a belated first tour appearance after being named among the replacements for Saturday's appointment with New South Wales Waratahs. But he might not even have set foot in Australia had his torn hamstring been a more serious problem than it transpired.
"If there is one time in four years not to pick up an injury or little niggle it is at the start of a Lions tour," Kearney said.
"My timing couldn't have been any worse. I got a scan done in Hong Kong, and it could easily have gone either way. I could have been getting the first flight back to Dublin, or going off to Australia with the lads.
"It does give you a bit of perspective, especially when you then see a few boys heading home like Cian (Healy) and Gethin (Jenkins). Then you start to feel that luck is on your side. Then you get the chance this weekend to put the jersey on again, which is a fantastic feeling, albeit it might be a little bit late."
Kearney, 27, replaced an injured Lee Byrne during the first Lions Test in South Africa four years ago, and he went on to become a pivotal player for the tourists during that series. This time around, he has significant ground to make up on the anticipated first Test Lions number 15 Leigh Halfpenny, but Kearney insists it will not be for the lack of trying.
"Leigh has done fantastically well," he added. "He found himself in the (Wales) full-back position by chance a little bit. James Hook was there for a while, and after Lee Byrne they never really had an established full-back, and he stepped in there and made the position his own pretty quickly."
While Kearney prepares for a 2013 Lions tour bow, his Ireland team-mate Simon Zebo will make a debut in the famous red shirt. This time last week, he was preparing to face the US Eagles in Texas.
The 23-year-old arrived in Australia on Tuesday after being summoned as cover for hand injury victim Tommy Bowe, and he has made the starting XV, wearing the number 11 shirt. With George North reporting a tight hamstring against the Combined Country XV three days ago and not training on Friday, Munster back Zebo could even thrust himself into the Test picture.
"It has been nothing but excitement ever since I got out here. I am happy to be here," said Zebo, who had an ice pack strapped to his thigh, but dismissed any fears about his fitness.