The Celtics have played nothing this season, so what defines September is a return estimate and a number: Jayson Tatum's day-to-day left knee is pointed toward an October 1 return, and Boston's payroll already sits above the luxury tax line. Everything else on the books — a same-day signing and release, a single reported interest in a free agent — is noise around those two facts.
Tatum's return date is the real season opener.
The single injury note on file says what is currently known: Tatum is day-to-day with a left knee issue, and the estimated return is October 1, three weeks before Boston opens the regular season at Detroit on October 20. That gap is a runway, not a guarantee, and camp will spend itself confirming or erasing it.
The payroll sheet reads like a warning label before camp even opens.
Boston carries $201.4 million in salary against a $200.4 million luxury tax line, with Tatum's $58.5 million and Paul George's $54.1 million as the two anchors and Derrick White's $30.3 million a distant third. A team already above the line before a game is played has less room to maneuver than any win total will suggest.
The preseason schedule leans twice toward the team that ended last season.
Four exhibitions are set: at Cleveland on October 8, home against Philadelphia on October 10, home against Charlotte on October 14, and back at Philadelphia on October 16, ahead of the regular-season opener at Detroit on October 20, carried on NBC and Peacock. Facing Philadelphia twice in one preseason may be scheduling coincidence, but it puts the roster in front of the team that eliminated Boston last spring before the games count.
The one substantive rumor is an interest, not a deal.
Jake Fischer reported that the Celtics have interest in guard Devin Carter, with no trade framework or compensation attached, and no reason yet to treat it as more than a name Boston is watching. The other transaction on the books, signing and waiving free agent Hank Morgan on September 11, added no one to the roster; it is paperwork, not a decision.
Last season's numbers set the bar this camp has to clear.
Boston finished 56-26 a season ago with the league's No. 2 offense, No. 4 defense, and a net rating of 8.3 built at a pace of 95.6 — a good team that wins by not giving the ball away rather than by outrunning anyone. Whether that identity holds for a full season with Tatum and a 36-year-old George sharing the frontcourt is what camp exists to answer.
Will Jayson Tatum be ready for opening night?
The estimated return date is October 1, which is before Boston's October 20 regular-season opener at Detroit, but the designation is day-to-day and no clearance date has been confirmed.
Are the Celtics over the luxury tax this season?
Yes. Boston's payroll is listed at $201.4 million against a $200.4 million luxury tax line, putting the team above the threshold heading into camp.