Undertaker's WWE return is going to be on this Sunday's WWE Royal Rumble 2015 PPV and it looks like it would set up a triple-threat match between Sting, Triple H and him, if the reports and rumors are to be believed.

Alex Reyes of LatinoWrestleZone has reported that Undertaker is going to be an entrant at this year's Royal Rumble and that his appearance is only there to tease a showdown with Sting.

Previously, we have reported that it has been rumored that Sting would be the one to eliminate the Undertaker from the Royal Rumble and that would be the start to their feud that would culminate at a match on WrestleMania 31.

However, the Sting vs Undertaker match at WrestleMania 31 could have another entrant in Triple H. Sting's current storyline in the WWE is with him making the life of the Authority a living hell and it has been widely reported that Sting is going to have a match with Triple H and that match could be at WrestleMania 31.

How can Sting vs Undertaker happen if Triple H is in the mix? Fans over at Reddit speculated that with Sting eliminating the Undertaker at the Royal Rumble, Sting is going to be eliminated by Triple H at the match. It would set up an upset Undertaker stalking Sting while the WCW icon makes Triple H suffer.

Meanwhile, reports are indicating that Undertaker's would-be match with Sting could be his last match with the WWE.

Nick Paglino of WrestleZone has reported that the Undertaker could be inducted into the WWE Hall of Fame just before WrestleMania 32, giving credibility to the rumors that WrestleMania 31 would be Undertaker's last match with the company.

"The Undertaker could be inducted into the WWE Hall of Fame in 2015 should WrestleMania 31 be his final in-ring appearance. There has been talk for years that Undertaker would be inducted into the Hall of Fame following WrestleMania 32, which takes place Cowboys Stadium and is expected to set an all-time attendance record."