The 24-year-old striker has signed a three-year deal ahead of his side's clash with Watford on Saturday, where he could make his debut.
Simon Grayson was delighted with the deal."Ross is a player of good quality," he told the club's official website."He's proved in the Championship he can score goals and hopefully he will continue to do that with us."
McCormack scored 33 goals in 88 appearances for Cardiff, including two from his three appearances as a substitute this season.
Source: PA
Source: PA