Felton tweaked his hamstring in Game 3 and did not return after playing 13 minutes. Jefferson has been dealing with a toe injury but has played in all three games of the series thus far.
The Mavericks are 3-point underdogs.
Smith now faces a possible league suspension for the next round of the playoffs after the NBA reviews the penalty. Smith said he was drawn into the action by Crowder pushing him in the back on the play.
"I know I'm nervous as hell to see what could come out of this," Smith said.
Udrih sat out Game 3's win over the Trail Blazers with an ankle sprain.
Udrich will likely see extended minutes on Monday with the unavailability of starting point guard Mike Conley (eye).
Conley left Saturday's game and did not return after getting hit by an inadvertent elbow from the Trail Blazers' CJ McCollum during the third quarter.
"He's in good spirits," Grizzlies center Marc Gasol said.
"He came in, shook everybody's hand, said a little something to everybody individually," added Grizzlies guard Courtney Lee.
Backup point guard Beno Udrih, who sat out Game 3 with an ankle injury, will play Monday and should see extended minutes as a result of Conley's unavailability.
"He's got the biggest heart," Grizzlies coach Dave Joerger said of Conley. "He's the purest-hearted guy, he's a true leader, he's a winner, will do whatever's asked of him, and what isn't asked he looks for to help the team win. It's a big blow."
Crowder left the game with a sprained left knee as a result and will not return.
According to the New York Daily News, teammate Joe Johnson said Williams is enduring a severe case of tendinitis as well. Williams has been banged up for a while so news that he's playing through this injury as well isn't too surprising.
If Williams sees his minutes limited against the Hawks, Jarrett Jack will step in and run the show at point guard.
Felton has a hamstring injury and Jefferson is dealing with a calf ailment. Both are considered game-time decisions. The Mavericks trail the Rockets 3-0 in the first-round series.
Crowder has averaged 12.0 points, 5.7 rebounds and 2.3 assists in three games off the bench during the series while shooting 52 percent from the field and playing 27 minutes per game. Smart has scored 9.3 points per game while shooting 47.6 percent from the field and playing 23 minutes per game in his three straight starts.
The Celtics are 7 1/2-point home underdogs as they look to avoid a sweep at the hands of the Cavaliers Sunday.