Brown (Achilles) is out for Thursday's game against the Knicks, Zack Cox of the Boston Herald reports.
Brown will be sidelined for the front end of this back-to-back set. However, it remains to be seen if he will be cleared for Friday's game against the Pelicans. With this news, Baylor Scheierman and Payton Pritchard could be a lot more involved for the Celtics.