This Robert Sheehan photo contains
costume d'affaires, costume d’affaires, costume, costume de vêtements, deux pièces, deux costume de pièce, maillot de salon, deux morceaux, deux pièces costume, costume salon, deux pièces de costume, and costume de salon.
I don't know how much he is in the movie but I'd still go just to see him. For the trailer he's in it at 1.30 - 1.33, it's not much but I freaked when I recognized him!