Roc Nations Sports, the sports agency founded by music mogul Jay-Z in April, on Monday has officially signed another big named client in Oklahoma City Thunder's own Kevin Durant.

The firm's spokesman Ron Berkowitz confirmed the news, and Durant later tweeted out a picture later in the afternoon of he and Jay-Z signing the papers.

"Grateful for this opportunity with Roc Nation Sports," Durant said, in the text above the tweeted picture. "It's go time."

"He has a 90.5 free throw shooting rate, the youngest player in NBA history to join the 50-40-90 club," Jay-Z was quoted as saying, above the picture. "A giving individual and a legend in the making. What more can I say?"

Durant is just the latest member of an impressive roster of clients Jay-Z has built up since jumping into the agency game, which includes Robinson Cano, Geno Smith and Sklyar Diggins.

It's also believed that Jay-Z will be representing New York Giants wide receiver Victor Cruz in some capacity in the near future.

According to ESPN, last week the NBA's and Major League Baseball's players' unions confirmed that Jay-Z himself was licensed to represent players in contract negotiations. Jay-Z doesn't have a license to negotiate contracts for NFL players, which has been a concern for the NFLPA.

The union is currently investigating whether Jay-Z violated the Runner Rule, which states that a person who doesn't have a license to represent players cannot recruit players to join an agency.

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