Following a long-term contract signing, the 20 year old is reported to have told Bild, "I am just 25-years of age in five years time. If I would have the desire to move on that would still be a good time.
"I made progress at Dortmund last season and it would be too early to move abroad," however, he added, "I still have a lot to learn. At this point in time it would take an extraordinary bid to see me leaving.
"This would be great for both, Borussia Dortmund and me. They would have big money and I would know that this new club is really interested in me as a player."