A season-ending knee injury to Brodie Smith and Mitch McGovern's hamstring injury could force at least two changes to Adelaide's side for Friday night's preliminary final with Geelong at Adelaide Oval.

Star midfielder Rory Sloane will come back into the side after missing the qualifying final recovering from appendix surgery.

His return will allow Paul Seedsman or David Mackay to shift to the half-back flank to cover for Smith, who tore his ACL.

If McGovern is ruled out with a hamstring injury suffered at training last weekend, midfielder/forward Wayne Milera and swingman Andy Otten are the most likely replacements.

Milera impressed in the scratch match the Crows' reserves had against Greater Western Sydney's reserves in their most recent hit-out. 

Troy Menzel and Curtly Hampton could also be considered.