I reckon it's got to be either Spalletti or Lopetegui. The way they are both - unprovoked and after success - engineering their way out of their current clubs makes it feel like they have something lined up.
Unless its for a big final pay day (he's mid 60s), I'd imagine Spalleti would be aiming higher than us having just bagged Serie A. I'd also question whether he's right given his age - we need some stability as changing managers every 12-18 months isn't great for our reputation and can't help attract genuinely decent up and comng managers like de Zerbi
Lopetegui, I understand, even if not massively exciting.