Frank is a highly-rated goalkeeper who enjoyed two successful loan spells with Derby County from Blackburn Rovers in the 2010/11 season before making the move a permanent one in May 2011.
Derby agreed an undisclosed fee for his services and the shot-stopper put pen-to-paper on a three-year deal with the club.
The former England under-21 international had been a long-term target of Rams boss Nigel Clough and showed his quality with some impressive performances between the posts whilst on loan.
A Blackburn Rovers Academy product, Fielding never made a competitive appearance for Rovers' first team, but he was on substitute's bench in the Premier League on a handful of occasions as cover for Paul Robinson.
He used loan stays at Wycombe Wanderers, Northampton Town, Leeds United and Rochdale to develop his talent before heading to Pride Park.
Frank is also highly thought of in the England set-up and he has been in Fabio Capello's full England squad, with his latest call-up coming in August 2011 for England's Euro 2012 qualifiers against Bulgaria and Wales .