Al Horford, Boston Celtics reportedly agree to two-year contract extension
Celtics, Al Horford Agree To A 2-Year, $20 Million Extension
Celtics & Al Horford Agree on Contract Extension
Celtics trade Kemba Walker and first-round pick to Thunder
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Celtics reportedly finalize three-way deal to acquire Kristaps Porzingis, send Marcus Smart to Grizzlies
REPORT: Celtics and Al Horford Agree to A Two-Year Extension
Celtics reportedly extend Josh Richardson for one more year - NBC Sports
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