“Collin has been a part of the United family for several years, and we wish him the best as he continues his career,” United General Manager Dave Kasper said in a written statement.

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Martin, 22, was affiliated with United’s youth academy and became the club’s sixth homegrown signing. He ended up making 15 league appearances and seven starts and posting one assist as a rookie. He was appeared in U.S. Open Cup and CONCACAF Champions League matches and went on loan to the third-tier Richmond Kickers several times.

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Martin’s departure is unrelated to United’s pursuit of another homegrown candidate from Wake Forest, midfielder Ian Harkes, the son of former D.C. and U.S. national team captain John Harkes. The family hired Lyle Yorks, a prominent soccer agent, to handle negotiations. The sides met Tuesday.

Ian, who guided the Demon Deacons to the College Cup final last month, is also weighing possible European opportunities. He was born in England near the end of his father’s decorated pro career and holds a British passport, which would help alleviate the work permit issues that American players often face.

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United, though, does seem like a logical first step for Harkes, a Gonzaga High School graduate from Fairfax who would almost surely receive playing time as a rookie and become a candidate to succeed starting defensive midfielder Marcelo Sarvas, 35, in the near future.

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United’s other homegrown prospect, midfielder Eryk Williamson, is expected to return to the University of Maryland for further development after an ordinary sophomore season.

History of D.C. homegrown players

2009: Goalkeeper Bill Hamid (Annandale), entering eighth full DCU season, U.S. national team candidate

2010: Midfielder Andy Najar (Alexandria), sold to Belgian club Anderlecht in 2013 for $3 million

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2010: Defender Conor Shanosky (Sterling), released in 2015, joined USL’s Louisville City, now full-time with Richmond Kickers

2011: Defender Ethan White (Kensington), part-time starter traded to Philadelphia in 2014, now with New York City FC

2013: Forward Michael Seaton (Capitol Heights), traded to Portland in 2015, now playing in Israel

2013: Midfielder Collin Martin (Chevy Chase), traded to Minnesota in 2017

2014: Defender Jalen Robinson (Baltimore), entering fourth full DCU season, back-up center back