Midfielder Jack Colback has been "hit for six" by an illness which has kept him out of Nottingham Forest's last two games.
The 32-year-old started the Reds' opening Premier League clash against former club Newcastle United. But he was ruled out of the matches against West Ham United and Everton, and he will also be unavailable for Tuesday night's trip to Grimsby Town in the League Cup.
Colback has now been able to link up again with his teammates, having been absent for more than a week. However, he is not yet back in full training, with the club looking to gradually increase his levels in the coming days.