Adelaide could delay a decision on star onballer Rory Sloane’s fitness until the day of their looming AFL blockbuster against Geelong.

Sloane was concussed during the Crows’ win against Melbourne and is in doubt for Friday night’s top-of-the-table clash against the Cats.

Sloane will undergo concussion tests throughout the week and Adelaide assistant coach James Podsiadly says a final test could be held on Friday morning.