Naylor has not featured for the Whites this season following back surgery in the summer, but has proved his fitness in a reserve-team appearance and is ready to return in the third-round tie at Elland Road.
Leigh Bromby has helped fill the gap in central defence so far this season, but the recent recruit from Sheffield United is cup-tied and Rui Marques is out with an Achilles injury, so Grayson must opt for Naylor or Lubo Michalik to start alongside Patrick Kisnorbo.
Grayson, who has no other new injury or suspension problems, confirmed he will pick from a full-strength squad, but hinted he could make changes to his line-up as he already has one eye on next Saturday's League One clash at MK Dons.
