Widespread change was guaranteed upon Pep Guardiola's arrival at Manchester City, but no one quite foresaw Joe Hart being shipped to Italian outfit Torino on loan.
The 29-year-old shot-stopper's future, both at the Etihad Stadium and as part of the England set up, is now in doubt as he attempts to re-establish himself.
A number of goalkeepers have since spoken about Hart's situation, with Gianluigi Buffon recently insisting that his English counterpart needn't worry about the setback.
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"He has many years of being a great goalkeeper ahead of him," the Juventus legend said.
But what did teammate Willy Caballero - who has played each of City's three Premier League games so far - make of Hart's departure?
Speaking to Tuttosport, per the Mirror, he said: "Hart is an absolute professional, total and complete.
"He has a dedication to his work that is uncommon, he's like a robot, a big cat. He never holds back, not even for a second.
"This is a player who knows how to make his presence felt. He has a strong personality on the pitch and is a real leader.
"In recent weeks it became clear he wouldn't be in the City squad, yet he never stopped working to keep the team together, to be one of us.
"He's world class and has everything it takes to do well in Serie A."
Caballero will soon feel the same pain as Hart, though, when Guardiola inevitably makes £17 million signing Claudio Bravo his No.1 goalkeeper.
City's manager recently insisted he will respect his players' contracts by rotating and giving them game time, but it seems beyond doubt that Bravo will play most regularly.
"Of course, it is not an ideal situation, but I will respect their contracts," Guardiola said recently. "I will be clear what will be the solution.
"If all four stay here, the best solution is for everybody to be involved in our idea. They are going to be involved in our idea.
"They are going to be used in rotation. So if Joe, Willy and Angus stay, then it won't be the same one who is always on the bench.
"Maybe they go into rotation to find a solution - the best for us and them. They need to play. The situation is not easy right now."
Guardiola's comments obviously came before Hart departed, so he now has three goalkeepers at his disposal.
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