Kilgallon said: "I feel personally I'm coming back into form after struggling for a while. People have said my commitment isn't here, but I don't think that's fair.
"Everyone goes through bad patches, but I've always been confident that I could turn things around."
The 25-year-old comes face-to-face with the man who brought him to Bramall Lane from Leeds in January 2007 when Neil Warnock's Crystal Palace visit the Lane.
Kilgallon added: "It will be a tricky game against Palace, who enjoyed a good win at Reading, but if we get all three points then we put ourselves right back in the mix before Christmas."