The England international left for Dortmund at just 17-years-old when he realised that game time for City would be rare. Since then, he has made six appearances in the Bundesliga, so his decision has been vindicated.
Speaking to The Sunday Times, via The Daily Mail, Sancho said why he made the decision to leave City: "
"A lot of young players come to Dortmund and become top, top players. I thought to myself, 'Wow, that could be me'. I want to be part of that history.
"They're proving, by the games I've played, that age doesn't matter — they'll play you if you're good enough."
Dortmund gave the youngster the number seven shirt after Ousmane Dembele left the club for Barcelona in the summer.
Sancho believes this gesture was significant: "
"Everybody just greeted me, it was chilled. Aubameyang, Gotze, Reus . . . just being normal. They [senior players] love my company and I love their company.
"Pulisic is only two years older, and what he has done for America, with big pressure on his shoulders, is an inspiration to me. When he plays, he treats it like it's easy, normal. That's how I want to be."
Sancho has always been considered a hot prospect. He won the Golden Player award for his performances in the European Under-17s Championship and figures within football have praised him, for example, Owen Hargreaves claimed he "
I've come a long way from being a kid, playing football on my estate!! Saturday was a big day for me. Making my professional debut for @BVB was a dream come true. Hopefully the first of many . I just want to thank @BVB for showing so much belief in me at such young age. #JS7 pic.twitter.com/YCm2AeJzGT— Jadon Sancho (@Sanchooo10) October 23, 2017