Derby County could sign an ‘incredible’ Premier League free-agent to fill Max Bird’s void following his departure. Derby County are preparing for their return to the Championship and Paul Warne will want to get his business done fast. The Rams boss has already claimed he needs nine or 10 players through the door at Pride Park, and several of those signings will be in midfield. Warne saw Korey Smith and Conor Hourihane leave on the expiration of their contracts while Ebou Adams and Max Bird returned to Cardiff City and Bristol City respectively. Bird’s departure has left the biggest void to fil…