Unless Nole trains in US, I doubt Cahill or McEnroe will join the entourage. Unless it's just for the short term US hard court season. Darren is under contract to Adidas, so unless Nole pulls rank with Adidas. I also have the feeling, from Cahill's commentary with ESPN, that Cahill is not that fond of Novak.
edit: And I take it you mean JMac, not PMac