Sancho signed for Dortmund from Man City in August in a deal worth £10m, after being named the best player at the U17 European championships in the summer.
The England U17 international has settled in well at the Bundesliga outfit, making his debut in their previous outing, and it would appear that he has his own fan in the dressing room in striker Aubameyang.
The former Man City star posted a video onto his Instagram story showing Dortmund's star striker scrubbing his boots after a training session.
Despite being 11 years older than his team-mate, Aubameyang clearly saw the funny side of things as both players were in hysterics throughout the video.
Sancho was withdrawn from England's U17 World Cup squad and rejoined his Dortmund team-mates last week, after having already scored three times and assisted twice in the three group games.
He then made his debut since his summer move, coming on as an 84th minute substitute against Frankfurt on Saturday.