Adam Idah will be unavailable for Sunday's game away to Sheffield Wednesday due to problems during the week with his hernia.
"There's a little fear he will need surgery, but we'll wait for the assessment on that," Daniel Farke said in Friday's pre-match press conference.
A late decision will be made on the fitness of Ben Gibson, who missed out on team training this week due to hamstring problems. "He's just been training individually," Farke said. "I hope he can join us today and tomorrow. It's too early to confirm if he's really available."
"Marco Stiepermann and Orjan Nyland are both available after a proper training week, now it's up to competition for places."
Long-term absentees Michael McGovern and Sam Byram remain sidelined.