The Ghost isn’t the only thing from Star Wars Rebels you can spot in Rogue One, but you’ll need to pay attention and look closely for the other Easter Eggs.
In addition to taking part in the battle over Scarif the Ghost can also be seen at the Rebel base on Yavin IV, but there are some other references to Rebels in that base.
If you look very closely and pay attention, you can spot the Rebels’ droid Chopper at the base. Reportedly most of his footage was cut, but if you really look hard you can still spot him there. Also in the base you’ll hear for a “General Syndulla” summoned via the PA system. This happens right after Jyn gives her rousing speech to the Rebellion.
There are also unconfirmed reports that people spotted a Lasat (not necessarily Zeb) in Saw Gerrera’s hideout. Additional viewings of the movie will be needed to confirm if this is true or not. UPDATE: This alien doesn’t look like a Lasat. It’s the white alien to the left of the screen who looks right at the camera in Saw’s hideout.
Rogue One is actually set after the end of Star Wars Rebels, so from the movie we know that Hera ends up becoming a General in the Rebellion much like Han and Lando did and Chopper survives along with her. Right now there doesn’t seem to be any reference for the other Rebels crew outside of Hera, Chopper, and the Ghost itself in Rogue One.