The Boston Celtics are listing guard Marcus Smart as doubtful to face the Miami Heat on Wednesday.

Smart has an abdomen contusion.

Smart left Sunday's game against the New York Knicks after suffering the injury. The Celtics are 14-5 on the season. They are tied with the Heat for third place in the Eastern Conference standings.

In 19 games this season, Smart is averaging 11.9 points, 3.4 rebounds and 4.7 assists. He's shooting 37.7 percent from the field, 32.8 percent from beyond the arc and 87.9 percent from the free-throw line.

The Celtics are still without small forward Gordon Hayward, who is recovering from surgery to address a broken hand. Smart, the heart and soul in Boston, will try his hardest to play on Wednesday since he hates to miss games.

Kemba Walker, who replaced Kyrie Irving as the starting point guard for the Celtics, has gotten off to a fast start in Boston. The three-time All-Star is putting up 21.6 points, 4.7 rebounds and 5.0 assists in 18 games.

It's still unclear when Hayward will return to the lineup, which is why Smart's presence on the floor is so important for the Celtics since he does so many things for them that don't show up in the box score.

Smart, 25, is making $12,053,471 this season.