I don’t think the board should decide who we buy or don’t buy and don’t think they have the expertise to decide what a player is worth at any given point in the market.
What they can do, however, is set the budget. If Mourinho is told he has £100m then he can buy who he wants within that budget. Naturally he might argue to stretch it by ten or twenty million and the board can be persuaded or not. There is absolutely no point in the board setting a budget and not letting the manager get who he feels he needs, regardless of anyone’s opinion on the player.
Provided the manager does not exceed the budget then you back him and sack him if he gets it wrong.
There’s probably nothing wrong in the club setting a policy, either, which might require signing a player under 23 and only one over 28, if they so wish. A manager should be appointed on this understanding, however.
To say we can buy a player who’s 29 for £40m but not £50m is utterly pointless, if it’s not exceeding the budget. It’s half-arsed.