Inglis made the announcement via a video sent out to Rabbitohs club members.
"[It's] a decision I've made purely on my own, and something I've been thinking about in the last two-and-a-half months. At the end of 2020, I'll be hanging up the boots,
"I'll be giving away the game, but staying around this club hopefully for a long time after I retire," he said.
"For the next two years, I'll be giving everything I can to this great club. 2019 will be my last representative season, therefore next year, I'll be solely concentrating on the South Sydney Rabbitohs.