Sources: Robert Williams extension is not fully guaranteed, includes multiple incentives - masslive.com
Robert Williams removed from injury report after missing 8 games
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Celtics coach Ime Udoka says Robert Williams is in good spirits as he begins rehab - The Boston Globe
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While he was healing, Robert Williams studied Celtics' schemes - The Boston Globe
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Robert Williams III might be injured, but he's already back to work for the Celtics
Why Robert Williams Isn't Worried About Starting With Celtics
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Should the Celtics Trade Robert Williams? – Guy Boston Sports
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Robert Williams III injury update: Is Celtics center playing in Game 7 vs. Bucks? | Sporting News
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Celtics still planning to play without Robert Williams in series vs. Nets
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Celtics center Robert Williams sits out Wednesday night's game against Hawks because of sore knee - The Boston Globe
Injury Update: Celtics 'Optimistic' Robert Williams Plays Game 5 - Inside the Warriors
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B/R views Robert Williams as the 'biggest surprise' for the Boston Celtics
/cdn.vox-cdn.com/uploads/chorus_image/image/71758394/1393718527.0.jpg "Malcolm Brogdon and Celtics “super excited” for Robert Williams return - CelticsBlog")