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Al Horford misses Celtics-Lakers game Wednesday

Al Horford missed nine games in the 2016-17 season for the Celtics after suffering a concussion. Barry Chin/Globe staff

Celtics center Al Horford will miss Wednesday night’s game against the Lakers because he has entered the league’s concussion protocol, the team announced.

Horford was hit in the head on a foul in the second quarter of Boston’s win over the Hawks in Atlanta on Monday. According to the Celtics, Horford began to experience concussion-like symptoms on Wednesday morning.

Last season Horford suffered a concussion when he was inadvertently struck in the head during an Oct. 31 practice, and he missed the next nine games. In that instance, Horford began to experience symptoms one day after being hit in the head.


For three weeks he had headaches and felt nauseous and was bothered by light, noise and motion.

“As the days kept going by, I started to feel worse,” Horford said last December. “Just a lot of things that wouldn’t go away. It was a lot of stuff I didn’t really understand, because it’s never happened to me before.”

Horford tried resuming workouts multiple times, but the symptoms kept returning. He was finally cleared to play last Nov. 19, and completed the rest of the season without issues.

“Concussions, you have to be really honest with yourself, and sometimes that’s hard to do,” he said in December. “As athletes, we’re always trained to play through stuff. And I’ve played through all types of injuries — ankle sprains, shoulder, whatever — and with the brain it’s just different. That was the hard part for me to understand.”

With Horford out, it is likely that Aron Baynes will start at center, with Marcus Morris, who missed Monday’s game to rest, playing power forward.

Horford is averaging 14.6 points, 9.2 rebounds, and 4.7 assists per game for the Celtics, who enter Wednesday night with a nine-game winning streak.

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