Sharp joined the club to replace Andy Dawson, who had moved to Hull City on a Bosman transfer, and has been a regular at left-back.
Paul Hayes initially joined the club last season after having his YT contract at Norwich City cancelled, he made an immediate impact in the first team's push for a play-off place but has had to settle largely for a substitute role this season.
Meanwhile central defender Jamie McCombe could be on his way out of the club again, as Conference club Accrington Stanley want to take him on loan.