Former Celtics guard Gerald Green is returning home. A source told Sporting News that Green will sign with Boston on a one-year, guaranteed contract. Green was originally the No. 18 choice by the Celtics in the 2005 draft.

Green has bounced around since then, playing for eight different franchises, and spending two years playing in Russia. He re-established himself in the NBA in 2013-14 with the Suns, when he averaged 15.8 points and played in all 82 games. He spent last year with the Heat, averaging 8.9 points in 69 games.

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The move will continue to feed speculation that the Celtics are working on a trade to bring in another star-caliber player, after signing Al Horford early in free agency. The Celtics — who are sending first-rounders Guerschon Yabusele and Ante Zizic back to play internationally for another year — have 14 guaranteed contracts on their roster, once they sign No. 3 pick Jaylen Brown.

Sources around the league have said that Boston remains active in seeking to make a larger trade.