While actor Stephen Merchant's role in Logan has not been confirmed, director James Mangold tweeted an image of the actor in his make-up for the film which seems to suggest he'll be playing Caliban, as has been previously rumored.
Taken w/ Leica S 007 Summicron 100mm, ISO 1600 1/250 ƒ2 -- by JM pic.twitter.com/8P3s5Mdruo— Mangold (@mang0ld) October 17, 2016
Merchant is best known as the co-creator of the original British version of The Office. As for Caliban, the Mutant-tracking former Morlock previously appeared in X-Men: Apocalypse, portrayed by Tómas Lemarquis.
Logan is due out in theaters March 3, 2017.