The Royal Rumble is the most unpredictable pay-per-view of the year, with the Rumble's surprise entrants being the most talked about topic.
Every year there are surprise entrants, with last year seeing the return of JBL, NXT's Rusev, El Torito and Kevin Nash.
It has also been announced that Sting will not be playing a part in the Royal Rumble pay-per-view, so he is not set for a return.
This year's Rumble was rumoured to be including 40 men to make room for some ECW Originals but now WWE has gone back to the 30-man rumble, which means there could be less surprises. That being said, these are the superstars most likely to make a return in the career defining match.
The former WWE World Heavyweight Champion hasn't been seen on WWE TV since he was taken out by The Authority as a way to allow him time to film The Condemned 2 for WWE Studios.
The Viper is set to return to WWE after he has surgery on his deviated septum, with the recovery time being just a few weeks, Orton could be a surprise entrant and could return as a face to take on The Authority.
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The former United States Champion was injured in the week leading up to Survivor Series and was subsequently dropped from Team Cena and replaced by Erick Rowan. Since then the Irish Superstar has been recovering at home in Ireland over the holiday season, but now he has returned to America and could be set for a return soon where it is rumoured he will make a heel turn.
Could Sheamus return to eliminate someone like Daniel Bryan to define his heel turn?
The king of mystery has been one of the most talked about superstars of 2014, even though he has been out of action. The former World Champion was set to leave WWE but after a meeting with Vince McMahon he decided to stay with the company and was set to return at Survivor Series.
Speculation stated that Rey wasn't going to return because he didn't appear at the Survivor Series pay-per-view. But if Rey wants a final run in WWE then the Royal Rumble is the perfect place for him to pick up a final rivalry to work on the Road to Wrestlemania.
The inspirational superstar suffered a foot injury back in November and hasn't been seen in WWE since. Bo played a part in the 2013 Royal Rumble where he established a rivalry with Bad News Barrett before he returned to NXT and was then called up to the main roster this year.
Dependant on Dallas' recovery rate, he could make a return at The Rumble and establish a feud for the coming months in order to retain his place on the mid-card.
Young injured himself bad in April when he tore his ACL and was then said to be out for 4-6 months. This time has passed and Young is back in training and could make a surprise return in The Rumble.
Young was in a rivalry with Titus O'Neil when he was injured and he could use his place in this match to continue this rivalry with Titus, also currently not a part of any other on-going rivalries.
The Animal won last year's Royal Rumble match and went on to fight for the WWE World Heavyweight Championship at Wrestlemania 30. He lost out to Daniel Bryan before leaving WWE the night after Payback to promote his new film Guardians of the Galaxy.
Rumours suggest that Batista wants to return for a final match against Triple H at Wrestlemania, but with Triple H set to face Sting at Wrestlemania this year it seems Batista may be absent.
The Slammy award winner for Animal of the Year was taken out of action a few weeks ago when he was Tombstoned by Kane consistently for two weeks before Adam Rose again turned on him.
Rose then appeared without The Bunny, but word is that the character is set for return soon and is just off TV selling the injuries he has sustained in recent weeks. A place in The Royal Rumble would allow the Bunny to step up and eliminate Adam Rose to extend their rivalry.
These seven guys are the most likely to return from injury at the pay-per-view at the end of this month. Superstars like Chris Jericho and Rob Van Dam have already declared that they have no plans to return to WWE for the Road to Wrestlemania, but that doesn't mean the late decision can't be made.
Rumours of surprise entrants and returns will continue throughout January as many superstars set their sights on the Rumble match to make their return from absence.
One thing is for sure, the Royal Rumble is the one match of the year that is full of shocks and this year will definitely be no different.