Wallace sat out Monday's game against the Atlanta Hawks with a sore left forefoot and was expected to miss up to a week. According to the Celtics, Wallace accompanied the team on its trip Tuesday, but did not participate in the shootaround Wednesday morning.
Wallace, who injured the front part of his foot during Sunday's win over Toronto, underwent X-rays after telling coach Doc Rivers he couldn't play Monday and, while the tests were negative, the training staff suggested some time off.
"Looks like a week, maybe," Rivers said Monday. "It's day-to-day, but I would say maybe a week. Maybe less.
"It started hurting him [Sunday] night after the game. In the locker room he was saying his foot was bothering him and then this morning it got bigger I guess. But when he came to the game, he thought he was going to play. He actually went out and and tried to warm up, and he came in and said, 'Hey coach, I can't go.'"
Wallace, who was averaging 10 points and 4.5 rebounds per game, was replaced in Monday's starting lineup by Brian Scalabrine.
A week's break seemingly leaves Wallace as possible to return for Monday's visit from Dallas. The Celtics travel to his old stomping grounds in Detroit next Wednesday.
The Celtics are also without Kevin Garnett, who has missed the last six games with a knee injury. Garnett resumed workouts Monday and Rivers indicated at that time that the forward might be ready to return in 10 days.
Chris Forsberg covers the Celtics for ESPNBoston.com.