The Blues will deploy officials, including their integrity officer, to gain a fuller picture of what transpired on Saturday, the sources said, speaking off-record. Once the findings are handed over, it will be up to the AFL to decide whether to take any action against either player, and whether to involve its integrity unit.
Carlton has described the medical treatment of the two players as separate incidents. Cowan was taken to hospital by ambulance after a night out, while Hayward took an Uber to hospital for treatment to a cut head after falling following a night out.
The club's statement on Cowan said he had received medical treatment "and underwent observation, before being discharged a short time later".
The internal probe comes as the club seeks to establish a full account of events on Saturday night before reporting to the league's competition office. The AFL's integrity unit may become involved once Carlton passes on its findings.