Smart suffered a left ankle contusion in Friday's matchup with the Warriors and will not return.

EDGE Analysis

Smart missed the first three games of the season with an ankle sprain and could now miss more time due to a similar injury. The Celtics are in the middle of a back-to-back set of games, leaving the guard a game-time decision for Saturday's matchup in Detroit. If he is ruled out, expect James Young to have an expanded role off the bench.