Surveillance photos of the suspects were released Sunday.
The men were riding in the victim's cab in January in the area of 200-North Des Plaines Street. Investigators say they beat the cab driver about the head, face and body and then fled the scene.
Authorities describe both men as white males between the ages of 30 and 35. According to police, one man is about 5 ft. 7 inches tall, weighing 180 lbs., while the second man is about 5 ft. 8 inches tall, also weighing approximately 180 lbs.
Police said both men have black hair.
Anyone with information should call Chicago police.