"That's... I don't know..."
City were willing to pay the player £30,000 a week to stay at the club, but he chose to take his career to Dortmund, where he is now impressing in the German top flight.
While the game at Stadion HNK Rijeka was played in an empty ground due to a UEFA sanction against the hosts, a group of England fans managed to find a vantage point on a hillside to watch proceedings.
Sancho, 18, is in England's squad for the Nations League double header against Croatia (Friday night) and Spain (Monday), as is 19-year-old Mason Mount who is on loan at Derby from Chelsea.
Although Sancho's overall statistics might not be as impressive given the fact that he has been most often used as a super-sub, we can certainly expect the teenager to become a more prominent part of the Dortmund starting lineup after the worldwide break.
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Christian Pulisic, the United States of America worldwide and a Dortmund team-mate, has been a big influence: "He is another young guy, and I learn from him".
"I was a bit surprised, to be fair, because obviously I'm so young so I have still got a lot to learn", he said with a smile.
"You just want to go out there and do your best and I'm sure everyone will". Not everyone is comfortable moving from home. By doing that he has also sent out a wider message, namely he is watching all English players, including those who are overseas. It's a dream come true, Sancho added. It was a really great performance against Australia, with lots of entries into the opposition box and they would have got more out of it in regard to the result had it not been for the referee, who missed two clear penalties. It's alright. It's a bit hard, but I have the basic words. As part of a punishment dating back to an incident in 2015, when a swastika was daubed on the pitch in Split before a game against Italy, the World Cup finalists will play this game behind closed doors.
"But that won't faze me at all".
Even as a kid he always loved football, and he invariably wanted to play for a big premier league team.
Reports have already surfaced that the biggest teams in England could be prepared to pay £100 million for Sancho, something that seemed baffling to the teenager. I just felt my (right step) was going to Dortmund'.