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An international player is eligible to sign with a Major League team between Jan. 15 and Dec. 15. He must turn 16 before he signs and be 17 before Sept. 1 the following year — in practical terms, that means players born between Sept. 1, 2005, and Aug. 31, 2006, will be eligible to sign in the upcoming signing period. Players have to be registered with Major League Baseball in advance in order to be eligible to sign.