Clustering Basketball Players

Let’s say that a basketball team, e.g., the LA Lakers, has hired you as a data scientist to scout for potential players. Your job is to identify similar basketball players, cluster them in smaller groups, and have them practice with each other based on their strengths and weaknesses.

You train a clustering model to group similarly scouted players together.

How would you assess if your algorithm worked by placing similar players in the same groups without pre-labeled data in hand?