At this point, there is no direct indication that a member of the Green Lantern Corps will make an appearance in Justice League.
Some brand new fan art shows what a Green Lantern vs. Steppenwolf one-one-one would look like.
While the character line-up is definitely a star-studded one, diehard comic book fans know that one key character is missing from the League lineup: Green Lantern (or Green Lanterns, depending on how the franchise wants to spin it).
The two have previously worked on two new Justice League posters featuring Superman, Batman, and Wonder Woman strategically placed in different sections of the artwork fighting Darkseid.