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.

Paul Pierce, who helped the Celtics win the 2008 NBA title, will be inducted on Saturday.

Boston is scheduled to open on the road against the Knicks on Oct. 18.

Boston acquires a trade exception by sending Evan Fournier and two draft picks to New York.