NEW YORK — The Celtics Monday were forced to adjust quickly because of a Rajon Rondo suspension, the second time that has happened this season.

At the team’s shootaround Monday morning at the New York Athletic Club, coach Doc Rivers announced that Rondo would miss the showdown against the Knicks because he bumped into official Rodney Mott during the Celtics’ 89-81 win over the Hawks in Atlanta Saturday night and drew a one-game ban.