Kilgallon looked to be heading towards the exit door following loan spells at Middlesbrough and Doncaster, but has been a revelation after being handed a first-team recall by Martin O'Neill.
"Matt has let no-one down," Bennett told safc.com.
"We're talking about a bit of a forgotten player who had a couple of spells out on loan as well as some time out injured.
"You have to say that he hasn't put a foot wrong since coming back. It's amazing what a bit of belief and a second chance can do.
"Things have really come off for him."