The USA midfielder is being linked with Liverpool in England.
Sancho says: â€œI'm happy to be a part of Dortmund. I have to say thank you to the manager for playing me, trusting me. It's a noisy stadium. Again, 80,000 people... it's not every day that you get to play in front of 80,000.
â€œI think it's vital (to be playing) because not everyone wants to play U23s. Everyone feels they're ready for the next step. Whatever you feel is right, whether that's moving to a new club or staying to fight for a position, everyone has a right to do what they want to do. I felt it was right to go.
â€œChristian Pulisic is another young guy, and I learn from him. His confidence in taking on players, whether there are four or five guys around him.
â€œHe tells me to do my thing. 'That's why you're here. You're Jadon Sancho.' Those guys make me more grounded."