Lewis hurt his hamstring Sept. 20 against Denver and Dawson strained his right calf last week. Both were listed as doubtful on the injury report Friday, along with right guard Floyd Womack.
None of the three practiced this week, but coach Eric Mangini wouldn't rule anyone out for Sunday's game against the Cincinnati Bengals (2-1).
"I think there's a chance for all the guys," he said. "You want to go to the end to make sure you give them the best opportunity." Lewis was replaced last week by Jerome Harrison, who had 16 carries for 52 yards.
The Browns (0-3) signed kicker Billy Cundiff last week. Cundiff made a 29-yard field goal in his only attempt.