Devin Carter Injury Update: Celtics Guard Out With Mono




Devin Carter injury update: the Boston Celtics' newest guard has been diagnosed with mononucleosis and could miss a few more weeks, according to The Boston Globe's Gary Washburn. Carter signed a two-way contract with the Celtics on Saturday, October 18, 2026, just one day before the diagnosis was reported. The illness explains why the 24-year-old missed Boston's final three preseason games.


The timing is frustrating, but the Celtics had already seen enough. Head coach Joe Mazzulla praised Carter's camp performance and defensive impact as the reason the team kept him.


Why is Devin Carter sidelined to start the season?


Celtics guard Devin Carter is sidelined with mononucleosis, per multiple reports on Sunday, October 18, 2026. The Athletic's Jay King also reported that Carter is still away from the team, and RotoWire lists him as without a timetable for a return, week-to-week until the team provides an update.





The Celtics' injury report today is otherwise clean at the NBA level, with the backcourt healthy behind Derrick White, Payton Pritchard and Mike Conley. Still, Carter's absence means Boston will open the 2026-27 campaign without its most promising backcourt developmental piece, and the Maine Celtics will also have to wait — the G League season does not tip off until early November, giving Carter extra time to recover if the illness lingers.


How did Devin Carter earn the Celtics contract?


The Devin Carter Celtics contract is one of the most intriguing low-risk moves of Boston's offseason. Carter needed only one preseason outing to lock up the team's third and final two-way slot, posting 17 points, five rebounds, three assists and two steals — a team-best plus-22 — in 25 minutes against Cleveland on October 8. Mazzulla said Sunday he was drawn to Carter's ceiling: "You see the talent, the impact that he could have, and you want to be able to invest in that."


Carter was the No. 13 overall pick in the 2024 NBA Draft out of Providence, where he was the 2024 Big East Player of the Year after averaging 19.7 points, 8.7 rebounds and 3.6 assists. He appeared in 74 NBA games over two seasons with the Sacramento Kings, starting 12, before Sacramento traded him to Atlanta in a June salary move. The Hawks waived him in September, putting the 24-year-old guard on Boston's radar.


CelticsBlog noted the parallel to Neemias Queta, another Kings castoff who became a rotation piece in Boston. Ron Harper Jr. went from an Exhibit 10 to a two-way deal to a three-year extension in the same development pipeline — the path Carter hopes to follow once healthy.





What happens next for the Celtics without Carter?


The Celtics open the season Tuesday afternoon at the Detroit Pistons (3 p.m. ET), then manage the opening weeks with their established guards. Boston's developmental system gives Carter runway: he can spend time with the Maine Celtics when they open camp, sharpen his tools, and remain available to Boston on the two-way deal — up to 50 NBA games — if his jumper and defense translate.





The shooting remains the question mark. Carter shot 26.3 percent from three last season, though he hit better than 50 percent from two-point range. Boston's player development staff has a strong record of improving guards' shots — Payton Pritchard, Baylor Scheierman and Jordan Walsh are recent examples — and Carter's tenacious defense and rebounding for his size fit the Celtics' identity.


FAQ


When will Devin Carter return from mono?

There is no firm timetable. The Boston Globe's Gary Washburn reported Carter could miss a few more weeks, and RotoWire lists him week-to-week until the Celtics provide an update.


What is Devin Carter's contract with the Celtics?

Carter signed a two-way contract with Boston on October 18, 2026, joining Dillon Mitchell and Amari Williams in the team's three two-way slots. He remains eligible for G League action with the Maine Celtics and up to 50 NBA games.


Is the Celtics injury report clean otherwise?

Per Sunday reports, the Celtics' backcourt of Derrick White, Payton Pritchard and Mike Conley is healthy heading into the October 20 season opener in Detroit.


Sources:

https://www.celticsblog.com/boston-celtics-news/147981/devin-carter-diagnosed-with-mono-after-signing-two-way-deal

https://www.hoopsrumors.com/2026/10/celtics-notes-george-carter-brown-more.html

https://www.rotowire.com/basketball/headlines/devin-carter-injury-without-timetable-for-return-535118

Location: Boston, MA, USA

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