Sheffield United have made their second summer signing by bringing in left-sided defender Sam McCallum following his exit from Norwich City.
McCallum, 23, follows last week's signing of Leeds United defender Jamie Shackleton.
"Sam will bring energy to an area of the field where it's essential to be fit and athletic," said Blades boss Chris Wilder.
"He fits the profile. Sam loves to go forward. His Championship experience will be vital as we look to be very competitive in a notoriously tough division."
Kent-born McCallum began his career with Coventry City, then in League One, before signing for Norwich for a reported £3.