NEW YORK (CBSNewYork) — Move over, Jay-Z.

The rap mogul and part-owner of the Nets may have some company on stage when he opens up the Barclays Center next month.

“Yes, I will rap at his concert,” Nets owner Mikhail Prokhorov told Crain’s New York Business. “I am in rehearsals now 10 hours a day and plan to demand joint billing.”

Jay-Z is slated to open up the Nets’ new Brooklyn home with a series of concerts starting on Sept. 28.

So was Prokhorov joking, serious, or somewhere in between?

Remember, he has a sense of humor. This is the same guy who joked he’d “crush” Dallas Mavericks owner Mark Cuban in a “kickboxing throwdown” over point guard Deron Williams.

On the other hand, there’s this:

Prokhorov went viral earlier this year for his performance “on the mic-ro-phone.” The billionaire businessman declared himself the “real Russian Eminem” in a group rap viewed over 170,000 times on YouTube.

Stay tuned…

How much would you pay to see — or not see — Proko and Jay-Z rapping together? Let us know in the comments below!