Boston Celtics Joe Mazzulla: Jayson Tatum has had ‘zero setback’ in his Achilles rehab "He knows that if we get him back, we're just going to be a better team, and there's just no ifs, ands or buts about that." It remains to be seen when Jayson Tatum will return to the court. But with the Celtics now past the midway point of the 2025-26 season, Tatum’s return to the parquet floor this year might be in jeopardy. “The mindset has been relatively consistent (and) where it has been the entire season,” Mazzulla said of Tatum’s approach. “There’s been zero setback,” Mazzulla said of Tatum.