Nas is supposedly working on a fourth installment to King’s Disease, his Grammy-winning series with Hit-Boy. Fifty-Cent has reportedly been asked to rap on the project.

The information was revealed in 50’s recent interview with Billboard. He talked about his music comeback, expanding multimedia empire and the 20th anniversary of Get Rich or Die Tryin’.

Billboard reported that 50 is working on a new solo album with Eminem and Dr. Dre. Fifty is also prepared to feature on Nas’ forthcoming King’s Disease 4 LP.

Nas and 50 have released two songs together: “Too Hot” and “Who U Rep With.” They appeared on 50’s 2002 mixtape Guess Who’s Back?

The pair clashed in 2005 when 50 teased Nas on “Piggy Bank” for buying a tattoo of his now ex-wife Kelis. (“Kelis said her milkshake brings all the boys to the yard / Then Nas went and tattooed the bitch on his arm.”)

Talk of lasting tension, however, was snubbed in 2014 when Nas and 50 rapped together at Hot 97’s Summer Jam. In an interview with Hot 97 50 said, “I love Nas. He’s really the one. He is the guy, the lyrical – he was figuring out how to do it.”