Derby County's manager Nigel Clough admits he still has to decide which is his best pairing in central defence.
A mixture of injuries and illness have kept defenders out at differing times in the Rams' opening eight matches.
"We don't know which are the best two because we haven't seen them all in action yet," the Rams boss told BBC Radio Derby.
Derby have lost their last four matches in the Championship and are home to Bristol City on Saturday.
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