Whincup was Lowndes' teammate when the latter announced his full-time retirement mid-season in 2018.
Lowndes was celebrated at every event following his announcement at Townsville, before he was honoured by fans, drivers and teams in an emotional send-off at the Newcastle finale.
"I witnessed Lowndesy go through what we call the 'funeral tour' a few years back, which I was sort of trying to avoid," Whincup said on Wednesday.
"But it's good to get the announcement out of the way early, and certainly have clarity for all our commercial partners and also certainly the staff at the Red Bull Ampol Racing team about what the plans are.
"But really, we can probably talk about more of that at the end of the year.
"I watched Lowndesy go through the last year and he's so much more famous than I ever will be.
"People were sort of treating him like he was going to die the next year, but he's still a part of this pit lane as much as he ever was, and hopefully I can be the same as well, with the new role.
"So, if you want to get rid of me, unfortunately I'm still going to be around for a little bit longer, just not inside the car."
Whincup's final full-time season will commence with opening practice of the Repco Mt Panorama 500 on Friday. Tickets are on sale now.