They will discuss that before rafa agrees to sign the contract.
http://theoriginalwinger.com/2012-04-02-rafa-benitezs-fifa-com-interview-my-next-job-must-match-my-desire
"With the UEFA Financial Fair Play rules you have to manage the budget, you have to be careful and you have to promote young players from the academy."
Quote from a recent interview, good read. Won`t be a big problem.
Well If rafa is willing to work within a budget and promote our youth players, then I say get him signed up, might be able to get the next Alonso.
I think he would be able to get us some good talent from abroad for good prices, he has obviously been studying european football during his time out.