The Boston Celtics minimally shook up their roster in a three-team trade, the first-midseason trade for Brad Stevens as Boston's president. There could be more trades where that came from.

Al Horford, who reunited with the Celtics this offseason, might be on his way out of town again, per Jared Weiss of The Athletic:

After spending the 16th pick in the 2021 NBA Draft to acquire Al Horford in the offseason, the Boston Celtics are exploring trading him as they pursue another center, league sources told The Athletic.

Boston's reason for doing such a trade, besides the fact that Horford isn't as productive as he once was, is to save money. Weiss explained that Horford's partially-guaranteed contract could make him movable.

Only $14.5 million of his $26.5 million salary is guaranteed next season, making him potentially attractive to teams looking to move off long-term money or take on his salary for an additional asset. As the Celtics look to retool and get below the luxury tax, they have been unsurprisingly open to moving Horford and Josh Richardson, two core rotation players signed beyond this season.

After a three-year stint with the Celtics, Horford signed with the Philadelphia 76ers. He was traded after one season to the Oklahoma City Thunder, who dealt him back to Boston in exchange for a package including Kemba Walker and the 16th overall pick in the 2021 draft.

This season, Horford is averaging 10.8 points, 7.4 rebounds and 3.6 assists on some of the worst shooting splits of his career. With Robert Williams' emergence and Horford's hefty contract, it's sensible for Boston to explore trading the 35-year-old big man.