Per club policy, the terms of the deal were not disclosed.
Allen, who has spent the last four seasons with the Celtics, shot a career- high 44.4 percent from three-point range and averaged 16.5 points, 3.4 rebounds and 2.7 assists during the 2010-11 campaign.
The 6-foot-5 guard became the NBA’s all-time leader in made three-pointers this season, passing Reggie Miller on February 10.
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