New loan signing Diao picked up a calf strain during training this week and is to have scans to determine the extent of the injury whilst Blues skipper Cunningham sustained a hamstring injury during the Premier League game against Fulham last weekend.
Blues boss Steve Bruce is now down to the bare bones going into the game at Stamford Bridge with Stan lazaridis, Muzzy Izzet and David Dunn still all missing with long term injuries and Damien Johnson suspended havig picked up his fifth booking of the season in the 2-1 defeat to Fulham.