The 55-year-old, whose real name is Mark Calaway, said in a recent documentary that there was “nothing left for [him] to conquer”.
His words suggest plans to retire after a career spanning three decades.
But neither Mr Calaway nor the WWE have formally announced his retirement from the league.
The Dead Man, as he is nicknamed, made the comments during the new WWE biopic The Last Ride.
He spoke about his most recent match against wrestler AJ Styles, which ended with him burying his opponent and riding away on a motorcycle.
“It was a perfect moment. You don’t necessarily always get those. If there was ever a perfect ending to a career, that right there was it,” Mr Calaway said.
After almost 33 years of wrestling, The Undertaker legendary career is seemingly over, according to a WWE docuseries that debuted on Sunday.
During the final episode of his Last Ride docuseries, The Undertaker says he’s at peace with not wrestling again. This is something he wasn’t able to do despite teasing retirement a few times throughout the years.
The Undertaker stated that “I’m at a point that this time the cowboy really rides away.” After saying that he has nothing left to accomplish, he seemed content with what he has done and spending his future at home.
“I believe I’m at a place now, post-Boneyard, which was a hellacious battle against one of the best in the business. Here you are, climbing on your motorcycle and taking off. There was a lot of thought and a lot of emotion, one of those being ‘are you happy enough with that?’ It was a powerful moment. You don’t necessarily always get those.”
Mr Calaway is also known as a WWE pioneer. He was part of the first Casket Match at Survivor Series in 1992, the first Buried Alive match in 1996 and the inaugural Hell in a Cell match in 1997.
Despite enormous popularity, however, he has not chosen to follow superstars like John Cena or Dwayne “The Rock” Johnson into movies.
He told the BBC last month that he “had opportunities to do so” but had decided against it.
“It doesn’t work for me,” said Mr Calaway. “Wresting and WWE is my passion. It’s where I’ve completely invested and where my heart is at.”
On Sunday, he tweeted a clip from The Last Ride and wrote “you can never appreciate how long the road was until you’ve driven to the end”.
His revelation has prompted a wave of supportive messages on social media, using the hashtag #ThankYouTaker. AJ Styles said he would be “honoured” if their fight had been The Undertaker’s last.