The 21-year-old has announced that after five years with the Cherries, he is calling time on his stay.
Greenwood, who can play at left-back and centre-half, played with the Under-21s this season.
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The Republic of Ireland youth international is not yet sure where he will play next season.
He is out of contract and will likely have a fair share of teams interested in him.
During his time with the club, he had spells on loan at Wimborne Town, Poole Town, Weymouth and Eastleigh.