He has made a total of 622 career appearances in all competitions, and has scored 111 goals.
After completing the signing, Chesterfield manager Lee Richardson told his club's official website www.chesterfield-fc.premiumtv.co.uk:
"Steve is a big powerful nuisance who is very difficult to play against."
"Players of his type don't come along very often and I think our fans will like him very much."