Fremantle recruit Blake Acres has suffered a hamstring injury at training on Wednesday.
The midfielder will undergo scans on Thursday to determine the extent of the issue.
Dockers general manager of football Peter Bell said the club was unsure on the severity of the injury.
“The injury to Blake occurred while kicking during a drill at training on Wednesday,” Bell told fremantlefc.com.au.
“He will be sent for scans tomorrow, after which where we will better placed to determine the full extent of the injury.”
