The Boston Celtics could be without the services of Al Horford for Wednesday night's Game 2 matchup against the Indiana Pacers.

Horford, who is now listed as questionable, is dealing with an undisclosed illness:

Though he was dealing with a bout of knee soreness, Horford played fairly well in Sunday's Game 1 affair, and the Celtics managed to take a 1-0 series lead. In 32 minutes of action, he racked up 10 points on 4-of-10 shooting from the field, 11 rebounds, five assists and one steal. However, he did struggle a bit from beyond the arc, finishing just 1-of-4. In fact, the Celtics were off the mark as a whole (36 percent from the field):

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“They missed some shots, but we were really connected,” Celtics head coach Brad Stevens told ESPN during his postgame media availability. “We were really playing hard. We were really flying around.”

According to reports, Horford missed Wednesday's shootaround, but that doesn't mean he won't suit up for Game 2. Additional information on his status should be available shortly before tip-off. If he is indeed ruled out, Aron Baynes, Marcus Morris and Daniel Theis would likely see upticks in their usage rates.

Game 2 between the Celtics and Pacers is set to tip inside TD Garden at 7:00 p.m. ET on Wednesday night, with TNT having live broadcast coverage.