The teenager joined U18s teammate Yan Dhanda in joining the Reds' senior players on their mid-season training camp in Spain.
For Masterson, it was an invaluable experience both personally and professionally - not least due to the time spent working closely with Klopp.
"He’s a great manager and he’s very good socialising with the players," the 18-year-old told Liverpoolfc.com. "He is very good on one-to-ones and giving you advice.
"He made me more tactically aware of what I need to do and it was a great experience.
"The manager gives us great confidence because he really wants to see what you can do, what we have [coming through] in the Academy, and it’s great for us.