The England international has opened up about the "sacrifices" he has made playing for Borussia Dortmund, and he admitted it was tough moving to Germany after spending his youth career at Watford and Manchester City.
Speaking to Micah Richards and Reiss Nelson on England's official YouTube channel, he said: "Another challenge. This one has been the biggest one yet. Living abroad is a whole different game, away from everyone, family, friends. The sacrifice is deep.
"But, for me at the time, I just felt I was ready to challenge myself and challenge for a place in the first-team and I felt Dortmund was the right place to go at the time.
"Obviously I know their history, they're bringing through young players and I thought I had a real chance there so I took the opportunity and now, three years later, I'm doing well."
The 20-year-old attacker - who is a major transfer target for Manchester United and Chelsea - revealed how he took a bit of time to adjust to his new surroundings when he moved to the Bundesliga as a teenager in 2017.
He added: "The first three or four games I wasn't myself. If you compare my Man City days to those first four appearances you'd be like, 'What happened?!'
"But once you get to play more and more you start feeling better, you start playing well, your first touch is better.
"I'm just happy I made that decision and grateful for all the things I've done."