The 27-year-old came off injured during the first half of Forest's clash with Derby County and Sharp says he hopes the injury isn't a bad one.
Cohen left the field after 15 minutes of play, when it was 0-0 between Stuart Pearce's men and their long-time rivals, led by Steve McClaren. Robert Tesche served as his replacement.
15' Sub: #NFFC captain Chris Cohen limps from the field and is replaced by Robert Tesche (0-0)— Nottingham Forest FC (@Official_NFFC) September 14, 2014
And, according to Sharp, Cohen is a 'great player' and one of the 'nicest' people he knows. A long-term injury, then, would be a cruel blow for the Forest man.
I really hope chrissy cohens injury isn't a bad 1 again great player and nicest lad u will meet.— billy sharp (@billysharp10) September 14, 2014
Cohen had only returned to fitness ahead of the current campaign, having been ruled out for the season last November with a knee injury.
The 27-year-old's side topped the Championship table before their clash with Derby but will now be hoping, like Sharp, that their skipper's injury worries are not too serious.
As for Sharp's Leeds side, meanwhile, they have gone two games unbeaten under caretaker boss Neil Redfearn, which is already an improvement on Dave Hockaday's spell in charge at Elland Road.
Sharp joined the Yorkshire club after leaving Southampton in the summer transfer window.