Managerless Huddersfield could be without midfielder Adam Clayton for their home FA Cup clash with Leicester.
Huddersfield, without a win in their last 12 league games, sacked manager Simon Grayson on Thursday after the club had slipped to within seven points of the relegation zone, while Clayton sustained a knee injury during last week's defeat at Watford.
Clayton was replaced at half-time by Keith Southern, who is expected to return to the starting line-up, although Oliver Norwood and Scott Arfield provide caretaker managers Mark Lillis and Steve Eyre with alternative options.
Danny Ward remains sidelined after breaking a bone in his foot. The unlucky winger missed five games with a knee problem and then suffered the latest injury in training last week when on the verge of a first-team comeback.
Defender Joel Lynch has missed the last three games with a hamstring injury and remains sidelined, but Town have no other new injury or suspension problems.
The Terriers, without a win in their last 12 league matches, won 1-0 at Charlton in the third round.
Leicester have no new problems ahead of the trip.
Ritchie Wellens is fully fit again after a knee injury and the experienced midfielder will be added to Nigel Pearson's squad for the fourth round tie.
Defensive duo Zak Whitbread and Sean St. Ledger are on the road to recovery following respective calf and hamstring strains, although Saturday may come too soon for either to return.
After a run of five wins on the spin that has helped push the Foxes into the automatic promotion places in the npower Championship, boss Pearson will be keen for his side to retain their momentum but he may opt to freshen things up.
Midfielder Andy King and strikers Martyn Waghorn, Jamie Vardy and Marko Futacs will be among those hoping to break into the starting XI.
Leicester have won both league meetings between the two sides this season, winning 2-0 at Huddersfield in October and most recently 6-1 at the King Power Stadium on New Year's Day.