Brown initially fell ill prior to an Oct. 30 win in Boston over the Milwaukee Bucks. He said he had to go to the hospital five times since then to drain an abscess on the inside of his leg that caused the infection, which also led to a high fever.
"I'm glad it's behind me now," Brown said before Thursday's morning shootaround at the Spectrum Center. "I'm feeling a lot better. ... I was pretty down and out."
Brown said he started feeling sick after participating in the morning shootaround ahead of the Bucks game, and he eventually had to go to the hospital. He missed three games for the Celtics, who have won five in a row.
Brown said he began feeling like himself again Monday, when he returned to practice, but ultimately had to go back to the hospital one final time and thus missed the trip to Cleveland for Tuesday night's victory over the Cavaliers.
Brown said he did conditioning and strength work this week, so he isn't expecting to face any limitations for Thursday's game.
"I'm in great shape. There shouldn't be any restrictions or anything," he said. "I talked to [coach] Brad [Stevens], so I should be ready to go."
Enes Kanter, who has missed the past five games with a left knee contusion suffered in Boston's season-opening loss to the Philadelphia 76ers, will not play Thursday night. Boston's other banged-up centers, Daniel Theis and Robert Williams, are expected to play.