They do have such a contract for Premier League games. What a rule agreed by the Premier League would do is allow for Premier League financial sanctions to be taken, rather than it being a dispute between broadcaster and team. Although there is actually a rule already in place which says the same thing but has an ultimate outcome of 'disciplinary action' being taken for failing to provide staff and players for interview to broadcasters.
So Fergie and Manchester United have gone against the FA...? Well they will get punished then.. If they are happy with that, it is none of anyones business then.