Adelaide Senior Coach Matthew Nicks has ruled out key defender Mark Keane from the Crows’ Round 20 clash against Collingwood at Adelaide Oval on Thursday night.

Speaking to the media on Wednesday morning, Nicks said Keane would miss the game due to illness, with fellow backman Nick Murray set to be included in the team.

“You would’ve noticed Mark Keane wasn't out there (at Captain’s run),” Nicks said. 

“Unfortunately, Keaney's crook, he has been all week. 

“It's been one that's just stuck around, so he's not going to play. 

“Nick Murray will play for us, so that's straightforward. Muz has been in really strong form in the SANFL, so it’s disappointing for Mark, but reinforces the strength of the squad and how important it is.”

The Crows will release their final team of 23 on Wednesday at 5.50pm (ACST).

Adelaide faces Collingwood at Adelaide Oval on Thursday at 7pm.

Tickets available here.