Sancho, a Manchester City academy graduate who was signed by Dortmund in 2017, has come into his own this season with seven goals and nine assists for the table toppers in Germany's top flight.
The 18-year-old has also featured regularly in the UEFA Champions League, making 28 appearances in all competitions this season.
"I'm happy that I've opened doors," Sancho told ESPN ahead of Dortmund's Champions League last-16 trip to Tottenham Hotspur on Thursday (AEDT).
"It's a good thing to give other players the opportunities somewhere else and not just at home. It's a good feeling, a nice feeling.
"They do ask me what it's like (making the step up from the reserves to the senior team), and I tell them truthfully: It's not easy. It's difficult."
Sancho is expected to start for Dortmund against Spurs with captain Marco Reus ruled out with a thigh injury.
