Sancho surprised by first England call-up
Sancho, 18, has starred for Dortmund, scoring once and contributing eight assists in 10 appearances – just three of those starts – this campaign.
The former Watford and Manchester City youth player was rewarded with a place in Gareth Southgate's squad, but said it came as a shock despite his form.
"I was at training when I first got the call-up and straight away I called my parents," Sancho told reporters.
"Obviously they were just delighted for me, and I just couldn't stop smiling for the whole day.
"I was a bit surprised to be fair because obviously I'm so young, I've got a lot to learn, I'm just grateful he [Southgate] is seeing my progress in the Bundesliga and I'm just very thankful."
@England pic.twitter.com/E7IZ6JO3D0
— Jadon Sancho (@Sanchooo10) October 9, 2018
Sancho could make his international debut when England face Croatia in the Nations League on Friday, or three days later against Spain.
"It means a lot to me, especially my family," he said.
"When I was a young kid, I always dreamed of obviously playing for my country. That's the biggest thing that could ever happen to a young kid like me.
"It would be a dream come true [to make my debut against Croatia]. I couldn't ask for anything better than that.
"Obviously I just have to keep on working hard in training and see what the manager does."