But it is Roc Nation Sports – an offshoot of his entertainment company of the same name founded in 2008 – making headlines in the summer transfer window. Bayern Munich’s Jérôme Boateng was the first football client, in 2015, before Roc Nation Sports International (RNSI) was established four years later with a focus on stars at big European clubs. View image in fullscreen A phonecall from Vinícius Júnior reportedly led to Yan Diomande signing with Roc Nation Sports. It is claimed Rainbow invested significant resources in the winger, including taking him for trials at Chelsea, Bournemouth, Crystal Palace and Newcastle before he was signed by Leganés. In the dog-eat-dog world of football agents Jay Z’s new kids on the block are certainly making their presence felt.