Double Olympic triathlon champion Alistair Brownlee says there is a "possibility of not seeing me in Tokyo" as the Yorkshireman considers competing at longer distances and not defending his Olympic title in four years' time.
Watch live coverage of the Triathlon World Series Grand Final in Cozumel, Mexico:
Elite women's final on Saturday 17 September, BBC Red Button, Connected TV and Online from 22:30 BST.
Elite men's final on Sunday 18 September, BBC Red Button, Connected TV and Online from 22:30 BST.
Highlights on BBC 2 at 13:45 on Monday 19 September.