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Bulls at Celtics | 8 p.m. (CSN)

Al Horford won’t play for Celtics tonight vs. Bulls

Al Horford.
Al Horford.(USA Today Sports)

Celtics forward Al Horford will miss Wednesday night’s game against the Chicago Bulls as he goes through the NBA’s concussion protocol program.

The Celtics said Horford reported being hit in the head during Monday’s practice but showed no concussion symptoms on Monday, or prior to Tuesday’s practice. But symptoms appeared during Tuesday’s practice, and Horford was immediately removed from the session. He was not on the court when the practice was opened to the media on Tuesday afternoon.

When asked about Horford’s absence on Tuesday, Celtics coach Brad Stevens said Horford “headed home sick.”

Before Horford is cleared to return, he will need to complete a series of tests without showing any concussion symptoms. If at any time he does show symptoms, he will be shut down until the symptoms go away, and the process will start over.

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As a final step, a member of the Celtics’ medical staff will need to consult with the director of the NBA’s concussion program.

The Celtics could move Tyler Zeller, who played well last week against the Bulls in Chicago, into the starting lineup or opt for a smaller lineup and move Jae Crowder to power forward. Meanwhile, the Celtics also could be without shooting guard Avery Bradley, who missed Tuesday’s practice with a sore shoulder. He is considered a game-time decision.

The Bulls will be without Hamilton native Michael Carter-Williams (knee, elbow) while reserve Doug McDermott is also in the concussion protocol and will undergo a series of tests this afternoons to determine his status for tonight.

Horford is averaging 12 points and 5.3 rebounds for the Celtics this season.

Bulls at a glance

■  When, where: Wednesday, 8 p.m., at TD Garden.

■  TV, radio: CSN, WBZ-FM (98.5).

■  Scoring: Jimmy Butler 20.7, Dwyane Wade 16.0, Taj Gibson 14.7.

■  Rebounding: Taj Gibson 9.7, Nikola Mirotic 7.3, Robin Lopez 6.3.

■  Assists: Rajon Rondo 8.7, Wade 3.7, Isaiah Canaan 3.0.

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■  Head to head: This is the second of four meetings. The Bulls defeated the Celtics, 105-99, last Thursday in Chicago.

■  Miscellany: The Bulls are scoring 113.7 points per game, most in the NBA . . . The last time the Bulls opened a season 3-0 was 1996-97, when they finished 69-13 and won the NBA championship . . . Chicago’s 31 3-pointers are the most through three games in franchise history.


Adam Himmelsbach can be reached at adam.himmelsbach@globe.com. Follow him on Twitter at @adamhimmelsbach