Derby boss Paul Warne has decisions to make ahead of Tuesday night’s Sky Bet League One clash with Exeter after suffering a series of injury blows.

Midfielder Jason Knight, who missed Friday night’s 1-0 defeat at Ipswich with the ankle and knee problems he suffered during the 3-1 Papa John’s Trophy defeat by Manchester City’s Under-21s three days earlier, is facing a month on the sidelines.

He has been joined in the treatment room by Curtis Davies and Tom Barkhuizen, while James Collins will sit out once again as he completes a three-match ban.

Conor Hourihane returned from a calf in...