Celtics coach Doc Rivers said Rondo was hurt in Thursday's 106-77 loss at the Los Angeles Clippers. Rondo participated in Boston's morning shootaround and took shots before the game at Golden State before deciding he couldn't play.
"I don't think it's that big of a concern, honestly," Rivers said.
Courtney Lee started in Rondo's place. Rivers said Rondo will be a game-time decision when the Celtics play at the Sacramento Kings on Sunday night.
Rondo, a three-time All-Star, had started the first 24 games for the Celtics this season. He is averaging 13.6 points, 11.7 assists and 5.1 rebounds.
Shooting guard Leandro Barbosa was scheduled to rejoin the Celtics late Saturday night. He is expected to play at Sacramento after missing the last three games for personal reasons. Jason Terry again started in Barbosa's absence against the Warriors.