Gawn arrived late to the session at Gosch's Paddock on Thursday morning with Sam Weideman and Mitch King handling the ruck drills in his absence.
It is believed Gawn may be suffering from a calf issue.
Jake Melksham did running drills away from the main group as he tries to prove his fitness following a hamstring strain.
Melksham missed the Demons' 96-point win over Gold Coast with the minor injury.
Michael Hibberd is still at least one week away from returning from a quad strain but was back running on Thursday.
Coach Simon Goodwin is scheduled to speak to the media at 12.40pm AEST.