As you know we need a striker minimum even IF Isak is staying. We could end up with both Sesko/Isak, buy Wissa with a view to shipping Isak next summer when there may be a bidding war for him.
That would be because we chose to gamble. Why would we do that. I don't think (hope)we would shoot ourselves in the foot. Again we do hold all the cards.
IF they do sell it'll only be when we have 2 strikers in and the offer meets our valuation of the player (£150 million +) I expect him to be here until next season. Be glad when this is sorted one way or another.