Official waiver in Boston

The Boston Celtics have waived guard Caleb Grill, effective September 14, leaving him without an NBA team just hours after adding him to their preseason roster on an Exhibit 10 contract. The move confirms his exit from the main roster and opens the usual path toward G League affiliate Maine Celtics.

The transaction appears in NBA.com oficial and was reported by HoopsHype, which places the cut within the same quick-turnover pattern Boston has used this summer with non-guaranteed training-camp profiles.

Grill profile

Grill, a 6-foot-3 guard aged 26, reached Boston after stops at Iowa State, UNLV and Missouri, where he was named SEC Sixth Man of the Year in 2025 with 13.7 points, 3.6 rebounds and 1.7 steals in 26.2 minutes. After going undrafted in 2025, he spent last season in the G League with the Windy City Bulls and the championship-winning Greensboro Swarm.

HoopsHype notes that the waiver does not break Boston project continuity: Grill fits the Exhibit 10 routine of players who pass through the main preseason roster before continuing their development with the affiliate.

What the waiver means

By leaving the main roster, Grill no longer occupies a training-camp spot and becomes a free agent until his next step within the Celtics ecosystem is defined. The most likely scenario leads to the Maine Celtics, where he could follow the Exhibit 10 pathway.

If he eventually joins the affiliate and spends at least 60 days in the G League, he could earn an Exhibit 10 bonus worth up to $91,000. For Boston, the cut fits the development rotation the Celtics have used while keeping one standard roster opening and one two-way opening available.

Roster context

Grill signed his camp deal alongside other preseason profiles and shares the same logic Boston already used with Hank Morgan: a brief pass through the main roster to formalize an Exhibit 10 and ease his continuation in Maine. The move does not change the competitive core of the team, but confirms Grill is available outside the NBA roster until another transaction is made.