"I'm not going to bring in someone who is not going to make us stronger. I want someone who can come in and push whoever is in the position now."
The Spireites are still hoping to sign Huddersfield Town defender Jack Hunt, following his six-month loan stay.
But Sheridan's attempts to sign him on a permanent basis are reported by BBC Radio Sheffield to have hit a snag.
The Terriers are now looking for a fee, which Sheridan is reluctant to pay - and it is understood to have been left to the two chairmen to try and strike a deal.
"We've watched Jack ourselves and had a lot of reports on his performances," Terriers boss Lee Clark told the Huddersfield Examiner. "And the feedback is very positive.
"The purpose of him going out on loan was to get some regular first-team football and that's been achieved."
After signing in July, Hunt's six-month loan spell ran out following last weekend's 3-2 win at Southend.
He was on the losing side just twice in 20 league appearances.
Source: BBC Sport