Big Show, Tye Dillinger, and Erick Rowan are currently in Phoenix, Arizona which is the site of Sunday's Royal Rumble PPV according to PWInsider.
The report says along with those three, Hornswoggle could also be a possible entrant in the rumble, but has yet to be spotted in the area.
We have these names announced for the Rumble
R-Truth (at #30), Drew McIntyre, Big E, Kofi Kingston, Xavier Woods, Seth Rollins, Jeff Hardy, Dean Ambrose, Samoa Joe, Bobby Lashley, Elias, Baron Corbin, Andrade, Jinder Mahal, Rey Mysterio, Mustafa Ali, Apollo Crews, Titus O'Neil, and Randy Orton.
WWE Hall of Famer Kurt Angle, Bray Wyatt and The Velveteen Dream have been discussed as possible Royal Rumble Match surprises for Sunday, according to a post from @Wrestlevotes.
On the way to PHX for the Rumble! A few names I keep hearing about showing up on Sunday as surprises: Kurt Angle, Bray Wyatt & Velveteen Dream. Nothing set, but those names have been coming up in conversations for the past few weeks. We shall see.— WrestleVotes (@WrestleVotes) January 25, 2019
A “big” surprise may be in the plans Sunday at the Rumble, one that’s being kept from nearly everyone. However, I’m not going to leak it. Two reasons, 1. If it happens, everyone should have a genuine reaction to the moment & 2. WWE doesn’t even know if it’s going to work out yet.— WrestleVotes (@WrestleVotes) January 26, 2019
And this has nothing to do with Kenny Omega.— WrestleVotes (@WrestleVotes) January 26, 2019