Officials at New York-based Star Boxing claim Roc Nation Sports chiefs had agreed to buy out middleweight Demetrius Andrade's contract for $2 million (£1.3 million).

In a $10 million (£6.3 million) lawsuit filed at Manhattan Supreme Court, they accuse Roc Nation Sports staff of changing their minds and cancelling the buyout and a planned lucrative bout involving Andrade.

A representative for Jay Z's company refused to comment on the case, according to the New York Post.