The "manager" shouldn't be in charge of player recruitment or contract renewals.
We, as United fans, should get used to this idea.
Of course, the "manager" (in this case ETH) should be very much involved in the decision making, but it should not be his call).
In a (very hypothetical, I hope) scenario where ETH wants to extend DDG's contract for another five years, on the same terms, he should be informed by a superior (that would be Murtough - yes, he should be above ETH in the chain of command) that this is not possible.
(He should also be informed that it's feckin' stupid for all sorts of reasons - but whatever, this is hypothetical, I don't think ETH considers DDG an ideal goal keeper at all.)