Update: This story has been corrected to accurately reflect the transfer fee paid for Matt Miazga in 2016. Multiple sources with knowledge of the deal confirmed the fee was $3.5 million, not $5 million as initially reported by the Daily Mail. It has also been updated to reflect the most recent transfer offer for Long: $3 million.



As Major League Soccer takes a more prominent role in the international transfer market, the league faces an important question: How does the world appraise MLS-developed players, and how can team executives maximize that valuation?



The New York Red Bulls are the latest team to find themselves grappling with these questions, prompted by interest in center back Aaron Long. The team has received multiple offers for U.S. international, a league source with direct knowledge of the discussions confirmed, though the club does not seem interested in selling their star defender. In a larger sense, the Red Bulls’ posture as they handle the...