John Cena, , Samoa Joe, Seth Rollins

John Cena declared his intention on having a title match at Wrestlemania 35 by announcing his involvement in the Royal Rumble on this week's Raw.
If Cena is in the rumble match, he has to be considered a threat to win it all. WWE still wants to pull the trigger on his inevitable 17th title win, and a Rumble win is an easy way to do it.
Look who just shut down all of Tony Khan's critics! More HERE.
But since he's basically bulletproof, he can simply just declare his intentions on an upcoming episode of either Raw or Smackdown. Someone new should win the match, and perhaps it will be... Seth Rollins.
Rollins is one of the favorites both sentimentally and logically to win the 2019 Royal Rumble. He's been positioned as the top face on Raw and routinely has 'matches of the night'. If Brock Lesnar is holding the belt in April, it will probably Rollins who wrests it off of Lesnar's shoulders.
He's already a made-man but hasn't won a Rumble match yet. If WWE wants to strike while the iron is hot, he'll be the last man standing in Arizona on January 27.
Samoa Joe is always treated like a threat and he will be entering his first Royal Rumble match. Joe is constantly hovering around the main event of either show he's on, but has routinely faltered in matches for the title. Could things turn around for Joe in this year's Rumble?