Johncock hurt his back at a training session last week, but while Sanderson labelled him a 'certain starter' on Wednesday, that start will be with the Port Magpies.
Returning from suspension, Bernie Vince was among four inclusions for the Crows when the squads of 25 were submitted on Thursday, along with Tom Lynch, Shaun McKernan and Brad Symes.
Josh Jenkins is the unlucky player to miss at this stage, though both Adelaide and North Melbourne will need to make three further omissions when final teams are lodged on Friday.
North Melbourne v Adelaide Crows
Sunday June 24, 2012 - 4.40pm
Etihad Stadium
Gates open at 3pm.
