
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.
“It means a lot to me, especially my family,” he said.
“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.”