The Celtics have signed Warriors free agent center Patrick O’Bryant to a two-year deal, according to NBA sources. The 7-foot, 260-pounder was the ninth overall pick out of Bradley in the 2006 NBA Draft by Golden State, but played sparingly in two seasons. The Celtics worked out O’Bryant, who is expected to back up center Kendrick Perkins, a week ago at their training facility in Waltham.
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