McCormack, 24, has signed a three year deal for an undisclosed fee.
Best of luck Ross.
Leeds boss Simon Grayson has told BBC Radio Leeds that a potential move for Cardiff City's Gavin Rae has not gone pass the enquiry stage.
He said: "When I spoke to Dave about Ross McCormack he mentioned one or two others who might be available, but it was just an inquiry and that's all it has been."