Al Horford tested positive for COVID-19 on Monday, and the mandatory 10-day quarantine means he probably won’t be available until after Boston begins its season against the Knicks on Oct. 20.

Dennis Schroder had missed a little time after suffering a left knee contusion.

BOSTON (AP) — Jayson Tatum is quickly rounding into regular-season form. The Boston forward had 20 points, nine rebounds and seven assists to help the Celtics beat the Toronto Raptors 113-111 on Saturday night in a preseason game. Tatum still has a little fine-tuning to do though after turning the ball over six times. But […]

Brown tested positive Friday, is asymptomatic and is entering isolation.

In a win over Orlando, Jaylen Brown looked in midseason form, while some of the young players struggled early before rallying in the fourth quarter to pull out a win.

The Celtics were not willing to give Al Horford a big contract, but now he’s back after stints in Philadelphia and Oklahoma City and expects to be a key contributor.

Ime Udoka, who is asymptomatic, was in his 10th day of isolation on Monday and will be available for the start of camp on Tuesday.

Jaylen Brown had wrist surgery on May 13, is pleased with his recovery and thinks he will be OK to compete when Boston’s camp opens on Tuesday.

Boston acquires Juancho Hernangomez in a deal that sends Kris Dunn and Carsen Edwards to the Grizzlies.

Louis King scores 21 points to help the Sacramento Kings cruise to a 100-67 victory over the Boston Celtics in Las Vegas.