Chesterfield have brought in experienced defender Georges Santos on a non-contract basis.
The 37-year-old began his career at Tranmere and went on to play for six other English clubs.
Spireites boss Lee Richardson explained that he plans to utilise Santos when he loses Aaron Downes on international duty.
"This arrangement is of mutual benefit as Georges was looking for a footballing opportunity," Richardson said.
"We need some more defensive cover especially in the short-term whilst Aaron Downes is on international duty with Australia Under 23s."
Chesterfield have also struck a deal with Stoke for Adam Rooney, bringing the striker in on a four-month loan deal .
The highly-rated 19-year-old has been a regular for the Republic of Ireland Under 21s and Richardson is positive Rooney will provide his side with an extra dimension.
He said: "Adam Rooney is a versatile striker who will provide us with fresh options up front and I am delighted he is joining us."