ZeroCrusade:
"Reject All Offers" only impacts the offers which you personally are in control of.
You don't control your chairman - you work for him. So, you don't get to dictate what actions he will take.
I've never seen a board "promise that it won't interfere", either.
. . .
That said, I
do think that there's an issue here:
I think the club's decisions about assets needs to have a much stronger tie to the current financial situation.
For example, if we've been massively profitable the past three years, I'd like to see even a hands-on chairman back off and let the manager run the club the (clearly successful!) way he has been.
Further, if he's already sold 4 players for 60M, he should be looking at that: the club has already made a huge profit this transfer season, and should probably be a buyer, not a seller, at that point.
On the other hand, if the club was steadily losing money, or had a huge debt, or had lost a bunch of money this season - yeah, cashing in on a player for 45M makes very good sense: take the money, because IRL the player always could blow out a knee and never be the same.
. . .
Pursuant to the "Considering the bid in context" aspect, with the 45% sell-on clause, I think your chairman should be
considering that. For the purposes of his "interfering chairman" decision to sell, he should be looking at the 45M bid as 45M * 0.55 = 24.75M ... and realizing that what profit he's going to see from it really isn't as jaw-dropping as the bid sounds.
(
Of course, then we protect all of our best assets by offering 50% sell-on clauses to keep our chairmen's mitts off..
... so maybe interfering chairmen would have to refuse to agree to that clause for high-value players.)
. . .
I'd also like to see a way to impact the chairman at this point.
For example, this seems a
perfect example of a time when we should be able to issue an Ultimatum. (
As cooLLedge said)
"No, listen, if you sell Chun Li out from under me, you'll have my resignation on your desk by the end of the day."
Results: either the chairman cancels the proposed transfer, or he fires you.

Ideally, if he cancels the transfer, he backs off of his "interfering" nature a bit as well.
. . .
Finally, there still
is something you can do. When the club comes in with a bid,
offer a new contract to the player. If he accepts your contract, he will reject the bidding player .. and that at least buys you some more time with him.