Two of September's reports already have answers: Devin Carter signed, and Caleb Grill didn't last a day past his own deal. What's left is quieter — a two-way spot unfilled since September 12, and three names cycling through notes columns with nothing attached to any of them.

The Carter thread ran its course in three days.
Jake Fischer reported interest in Devin Carter on September 11. Three days later, on September 14, Carter signed, and Hoopsrumors filed its own report confirming the move the same day. He is now part of the twenty-man group in camp. Caleb Grill's stay was shorter: a report from Paul Garcia had him signing a non-guaranteed deal on September 14, and he was off the roster by September 15 — the second such short stay of the offseason, after Boston signed and waived Hank Morgan on September 11.
The newest roundup names Boston without saying why.
A September 24 hoopsrumors roundup grouping minor transactions across seven teams — Boston included — carries a confirmed tag but no detail specific to the Celtics. It's the same shape as three earlier roundups this month that grouped Payton Pritchard, Jayson Tatum and Paul George into notes columns without a single specific attached to any of the three names.
Confidence scores separate the paperwork from the story.
Fischer's September 11 report on Carter carries a confidence score of 75, the highest of the group and the only one that read as a real lead before it closed. The Grill and Morgan reports sit at 38 and 29 — both explain themselves: two players who came and went inside a week, not story lines still developing.
The cap sheet leaves little room to add anything bigger.
Boston's payroll sits at $203.9M against a $200.4M tax threshold, with Paul George's $54.1M and Derrick White's $30.3M among the heaviest deals on the books. A September 12 report flagged one open two-way contract, and no candidate has surfaced since — the only real opening in a roster that is otherwise full and expensive.
Is Devin Carter officially on the Celtics roster?
Yes. Jake Fischer reported interest on September 11, and Carter signed on September 14, a move Hoopsrumors confirmed the same day.
Do the Celtics have any open roster spots left?
One: a two-way contract flagged as open in a September 12 report, with no candidate named since.
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