"I have [faced] a good line of hookers [in succession]. I have had Tom Youngs, Tommy Taylor last week. I could have Jamie George this week then Luke Cowan-Dickie the next. They just don't stop coming so I am just enjoying the games. That is uncontrollable, that stuff [the Lions]. I can't comment on it - I don't know what is happening. Either way I am going to be in a good place wherever I am this [northern] summer."
Growing up in New Zealand, Hartley became aware of the Lions thanks to a black and white photo of his father as a schoolboy with touring players. He thinks the snap dates back to 1966. His dad would have been 10.
Half a century on, Hartley refuses to view next Wednesday as a defining moment in his career. Ironically, given it was a clash with George that cost him his place in Stuart Lancaster's 2015 World Cup squad, he believes the only "unfinished business" he has is with Eddie Jones' side.
"There are still things I want to do in an England shirt," he said. "There is unfinished business there with the development of the team and where that is going. To be part of that is, in terms of ambition, is where I want to be.
"The Lions is just a bonus. The Six Nations has been played. However my form was, however I played, however I think, however you think, whatever the coaches and selectors think " they are relevant, everything else is irrelevant. That has been done. All can I do now is play well at the weekend for Saints and see what happens next week."
George's dynamic displays among Jones' prominent replacements have sent the Saracen firmly into Lions contention. While saluting a "top guy and a team man" - and confessing "I'm not sure I could make as good an impact as Jamie George" from the bench - lineout specialist Hartley also reinforced his own credentials.
"I do other things," he added. "I might not make 20 carries a game but I clear out rucks, I make tackles. And someone has to clear out rucks. But, as a hooker, it has always been coached to me - by all my coaches - that what they expect first and foremost from me is excellence at set piece. That is something I pride myself on."