The computer-generated image of a man found dead in the River Torrens in Adelaide has been released by police in an attempt to identify him.

Police divers retrieved the man's body from the Torrens just west of the Adelaide University footbridge on Thursday, but his identity and the cause of his death are not known.

Police and SES volunteers searched along the river and park areas on Friday for evidence.

The man is described as Caucasian, aged between 40 and 50 years old, with a solid build and a dark greying beard.

Police still want to speak with two women who they believe spoke to a man at the Adelaide Oval footbridge on Tuesday night.

They said the man was seen to enter the water from the riverbank next to the Festival Theatre, more than 500 metres away from where the body was found.

Police are appealing for information from anyone who had been in the riverbank area recently.

They are asking anyone who has been between King William and Frome roads in the past week and taken photographs of the area to let Crime Stoppers know on 1800 333 000, as their images might prove helpful.