Saw something earlier this week from LeGrove saying the reason we didn't sign a ST/CF was because we had a 1 Out, 1 In transfer policy, but not only meaning we had to sell but we also had to sell in the same position we wanted to strengthen/replace. So when we couldn't shift anyone in the summer as CM (Xhaka) and CF (PEA/Laca/Eddie) we didn't get the green light to make any signings in those areas.
As such if correct IMO this sheds some light as to perhaps why the Vlahovic situation seemed to drag on for an eternity even before talk of Juve being interested, and would put a very different take on things if we caused the delay trying to sell PEA/Laca/Eddie and then Juve saw an opportunity and could make the deal happen as opposed to needing to sell before we could buy.
Could also explain how/why PEA was allowed to depart as he was, and even then it was too late to be effective and we didn't have enough time to go to a planC.