Paul Pierce wants to play at least one more year, retire a Celtic even if he's traded

From ESPN Boston's Chris Forsberg and Greg Payne at the C's shootaround this morning:

Paul Pierce said he wants to play at least one more season, will examine future after that.
— Chris Forsberg (@ESPNForsberg) May 1, 2013

Paul Pierce said he's taking a year-by-year approach for the rest of his career. Plans on playing next year and reevaluating things after.
— Greg Payne (@GregPayne_ESPN) May 1, 2013

Pierce said that if C's elect not to bring him back, he'd consider signing 1-day deal down road to retire a Celtic.
— Chris Forsberg (@ESPNForsberg) May 1, 2013

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