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Chicago Fire defenders Matt Polster and Brandon Vincent have benn included in the 30-player roster for the United States national team’s January camp.

This will be the second January camp for both players having participated in 2016.

Vincent has made one appearance with the senior team, in February in a friendly against Canada. Polster has yet to earn his first cap after being part of the under-23 national team.

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The 30 players will report to the National Training Center in Carson, Calif. on Wednesday, in preparation for the January 28 friendly against Bosnia and Herzegovina.