Ribeiro was injured after a knee-on-knee collision with Edmonton defenseman Theo Peckham on Saturday. He left the game for treatment and then returned to score two goals in the Stars' 4-1 victory over the Oilers.
"Ribby thinks he can play, which is a good sign, and he finished that game, which is always a real good sign," Stars coach Glen Gulutzan said. "However, for the player and his career, we have to take a look at that knee. He won't be a player for Tuesday. Once we get the results of the MRI we might fly him out Wednesday into L.A."
The Stars are visiting the Anaheim Ducks on Tuesday.
Ribeiro, who has 10 goals and 21 assists this season, also took a puck in the face and lost some teeth against Nashville last week.
In other Stars news, defenseman Sheldon Souray, who has missed the last six games with an ankle injury, practiced Monday. He is "60-40" to play in Tuesday's game against Anaheim, according to Gulutzan.
Defenseman Mark Fistric did not practice Monday due to the flu. He will travel with the team for Tuesday's game, but is questionable.
Goaltender Kari Lehtonen, who did not start Saturday's game due to a bout with the flu, practiced Monday and should be fine for Tuesday's game against the Ducks, Gulutzan said.
Mark Stepneski covers the Stars for ESPNDallas.com.