Liverpool's summer window was already the most curious we've ever seen from a Premier League champion.
Signing Bundesliga stars en masse and swapping out both full-backs implies a major tactical shift that will emphatically end the Jurgen Klopp era and herald the dawn of a new one.
But bringing in Newcastle's Alexander Isak would push Liverpool's transfer business into unprecedented territory, having already also signed Hugo Ekitike from Eintracht Frankfurt.
Not since the age of good old-fashioned 4-4-2s - when little-and-large strike partnerships were borderline mandatory - have we seen a top club sign two elite number nines in the same window.