Jamie Whincup could quit Supercars after 2019

Whincup recently signed a one-year extension to his current deal, which was set to run out at the end of this season.

According to Whincup the reason he asked for just a single season, rather than another three-year deal like the one he agreed back in 2015, is that he is unsure of what he wants to do beyond '19.

"I'm 35 this year. I definitely wanted to drive next year, but I'm not sure about 2020 at this stage," Whincup told Autosport.

"I'm committed to '19, but there's no real commitment after that.

"I'll assess this year whether 2020 is something I want to do, or whether I give the seat to a young bloke who's going to give it everything that they've got.

"Two years is a long time. One year is a long time. I'm just looking forward to the challenge of the next couple of years."

Whincup said agreeing the 2019 deal with Triple Eight boss Roland Dane had been very straightforward.

"I went to Roland and said 'I think I'm keen to go for 2019'," the reigning champion added.

"He said 'no dramas' and it was all done in about three minutes."

Whincup first joined Supercars full-time back in 2003, but was let go by Garry Rogers Motorsport after a mixed debut season.

He then returned with Tasman Motorsport in 2005 and an impressive second place at Bathurst alongside Jason Richards contributed to Whincup being signed by Triple Eight to partner Craig Lowndes in 2006.

That partnership has since yielded seven titles and four Bathurst 1000 wins.