BRODIE Smith's worst fears have been realised with scans confirming the Adelaide defender has ruptured his ACL.

Smith hurt his right knee as he attempted to tackle Greater Western Sydney star Josh Kelly in the opening term of the Crows' thumping qualifying final victory on Thursday night.

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The 25-year-old will not only miss the rest of Adelaide's finals campaign but will likely be sidelined for most, if not all, of next season. 

"The injury is really disappointing for both Brodie and the club as we start our finals campaign," head of football Brett Burton said.

"We will consult a specialist this week with the view to Brodie having surgery, which will unfortunately rule him out for the season.

"Brodie will still be an important part of the group as we continue through September."

Crows will rally around injured defender

Smith has played 143 games for the Crows since making his debut in 2011, and he was named in the Virgin Australia All Australian team in 2014.

Midfielder David Mackay moved to the backline once Smith left the ground and would be expected to remain there for the Crows' home preliminary final.

Adelaide will regain star onballer Rory Sloane (appendix) for that clash.