John Hinge (foot) could also join them on the sidelines but the Crows are confident tagger Robert Shirley (hip) will be available.
Bock has a sore back and Skipworth strained a calf in Saturday night's win over Hawthorn in Tasmania.
Defender Ben Hart is ready to resume but Jason Torney, who strained a quad at training late last week, will miss another week.
Ruckman Matthew Clarke and Michael Doughty are also ready to play but may return through the SANFL.
Captain Mark Ricciuto (hamstring), Jason Porplyzia (quad), Scott Welsh (leg stress fracture) are all at least another week away from being available.
