Sheffield United have signed Birmingham City midfielder Mark Duffy and Bury full-back Chris Hussey on two-year deals.
Duffy, 30, spent last season on loan at Burton Albion, making 45 league appearances as the Brewers won League One.
Hussey, 27, who joins for an undisclosed fee, made 50 appearances for the Shakers last season.
The duo are the new manager Chris Wilder's first signings for the Blades.
Find all the latest football transfers on our dedicated page.