I don’t think it’s completely crazy to suggest it could happen, even if he strongly denies the possibility and is probably being genuine at the time.
Emotions have a huge impact on decisions in this game. Oli is certainly not immune to that, as we’ve seen aplenty.
If he does lead us to lift the UECL, he could well take a look around at this group, that in this scenario he’s now led to three trophies, in a jubilant, celebratory, and victorious mood, with the Europa League entry secured, and suddenly he fancies having a crack at one more comp with the club (one that he has lifted with Eintracht...)